Kleinrock Orthodontics
Seth Kleinrock, DDS:
Practice Profile Page


Seth Kleinrock, DDS

Kleinrock Orthodontics
Hewlett, NY

Kleinrock Orthodontics
Long Beach, NY














A list of major dental treatments which I offer my patients:


Clear aligners


Comprehensive orthodontics

Space maintainers

Palatal expanders


Interceptive orthodontics


Offers Even28 at-home™? No

Offers Even28 at-dentist™? No

Offers Invisalign®? Yes


Monday: 8:00 am to 7:15 pm

Tuesday: Closed

Wednesday: 8:00 am to 7:00 pm

Thursday: 8:00 am to 7:30 pm

Friday: 8:00 am to 4:00 pm

Saturday: 8:00 am to 2:00 pm

Sunday: Closed


Monday: Closed

Tuesday: 8:00 am to 6:00 pm

Wednesday: Closed

Thursday: Closed

Friday: Closed

Saturday: Closed

Sunday: Closed





Check out what some of our happy patients are saying about us:

Chrissy C. from Lynbrook, NY (Source: Yelp)


Dr. Kleinrock’s office should be the model for ALL offices! From the moment you walk in you are greeted warmly by his AWESOME PROFESSIONAL Staff! They all wear Jersey’s with their names on the back so you know who everyone is in the office. They explain everything and make the paperwork/insurance EASY to understand. You NEVER wait long, however, while you are waiting to be called, they have video games, UPDATED magazines, and contests you can enter (this month is an Oscar theme and you can win a $$$ movie pass!). I don’t want to forget to mention how CLEAN the offices are. From the waiting area, to the cool Sport/Movie themed open floor plan exam rooms and all of the latest equipment. Above all, Dr. K. and his Staff make you and your kids feel comfortable and stress free. Even my youngest who isn’t a patient (YET) loves the office. My oldest said as we were leaving one day, “I hope I work in an office like that one day, they are so cool and look like they have fun!” I went to Dr. Kleinrock because of how beautiful my niece’s teeth came out, it was one of the BEST recommendations I’ve ever had. I cannot say enough positive things about this office! Dr. Kleinrock is THE BEST! –Chrissy Costello, Lynbrook, NY

Christine Comegna (Source: Google)


After 3 years of going to a different orthodontist we decided to switch to Dr Kleinrock’s office because we were getting nowhere with my sons mouth. Dr Kleinrock and his office staff are amazing and friendly. The facility is extremely clean and the policies he has in place for COVID-19 have made me feel very comfortable with bringing my son there. I highly recommend Dr Kleinrock!!

La Shawn Wilkes (Source: Facebook)


Thank you Dr.Kleinrock, Dr. Zeppieri and Team! Jade got her braces off yesterday and we love the results. The past 4 years have been a pleasure to come to your office. Always a professional and friendly atmosphere. Always on time and scheduling is flawless! I am thankful for this wonderful experience. Thank you!

Marion O. from East Rockaway, NY (Source: Yelp)


Couldn’t ask for better!! Great, fun, compassionate and very helpful office staff. Dr. Kleinrock explains what the patient is getting done and what needs to be done to get THE BEST smile. Dr. Kleinrock and staff make going to the orthodontist easy!! All 3 kids have BEAUTIFUL smiles…. HIGHLY RECOMMENDED!!!! Marion O.

Girault (Source: Google)


LOVE THIS PLACE!!!and LOVE MY NEW SMILE!!had an amazing experience with Dr. Kleinrock and his staff. As soon as you come in it’s always warm and welcoming with the awesome receptionist team along with Dr. Kleinrock. You won’t be disappointed Dr. Kleinrock is very professional, skilled, and enjoys his craft. Would definitely recommend if I could give more stars I would. Thank You!!!

Tracy D. from Merrick, NY (Source: Yelp)


I first went here about ten years ago to get Invisalign aligners since I never got braces when I was growing up and I wasn’t quite interested in getting regular ones. After some research I decided to choose Dr. Kleinrock since he was noted as an expert in the product. He did a great job on helping to straighten my teeth and fix the underbite I never knew I had with using the Invisalign and orthodontic rubber bands on part of the treatment. Throughout the treatment he gave me the trays to change every two weeks as he checked on my progress and made changes according to how my teeth shifted. My treatment was shy under two years after he extended my aligner sets by a few months at no additional cost to my payment plan that was agreed on. He was a great help even after treatment and I needed to get my retainer replaced after ware and tear. Dr. Kleinrock and his staff are fantastic in how they treat their patients. I recently convinced my fiancé to get his teeth fixed by Dr. Kleinrock as well. It’s nice to see that the process to get fitted for Invisalign has changed since I went and has gone digital as opposed to the three molds they used to have to take. In the waiting room there is a couple of tvs with video games, local tv and magazines to keep you occupied while you wait. Waiting time generally isn’t long at all anyway. The parking lot is on the smaller side, but I usually have no problem finding parking. I would highly recommend him to anyone who needs to get braces or aligners since their office gives the best professionalism and service.

Stephanie Augustin (Source: Google)


I had my braces removed by Dr.Kleinrock today and I am over the moon happy with the results!! For the past two years I’ve had an amazing experience with their dental team. Every visit was smooth and easy, no long wait times, and everyone always was very kind. I’m super proud of my results. Highly recommended!!

Elliot Wiseman (Source: Google)


My family has gone to Dr. Kleinrock for a number of years for my brother and myself. His work is always top of the line. The staff is courteous, caring, and quite funny. It is a very well run office. Many times they have gotten me into the office the day I call them for an appointment. Dr. Kleinrock is an excellent orthodontist, who always gets you in and out of the office without a moment to spare. He is very patient and thorough with his work and also keeps himself up to date on the latest methods . I have had braces twice in my life, once as a child (and of course I did not wear my retainer), and later in life when I had a jaw surgery. My teeth came out amazing and he made sure i had as comfortable a bite as possible. When the day came for me to take them off, I asked if he could do it right then and there being so frustrated with having these braces on, and he proceeded to get them off in a timely manner. 10/10 Always recommended

Jason Kaufer (Source: Google)


Seth Kleinrock is an amazing orthodontist and his entire staff is beyond accommodating. Although Seth’s office is over a 40 minute drive from our house, we consulted with Seth as a second opinion, at the high recommendation of a relative, after feeling uneasy with a local and popular orthodontist that we first consulted. Seth evaluated both of our children regarding their need for and the extent of any needed orthodontic care. Seth explained that the large gap between my daughter’s two front teeth was very straight forward to repair and did not require more than one year of treatment (very different from what we were told by the first orthodontist). Fifteen months later (delayed only due to COVID), her braces are off and her teeth are perfect. Seth has also advised us, after three separate consultations over the past year and a half, that our son’s mouth is not yet developed enough for braces and that we should wait (also very different from what we were told by the first orthodontist). Aside from having gifted hands and doing an amazing job correcting my daughter’s gap, Seth is honest and trustworthy. It is about doing what is right for his patient and not about the money. He did not recommend the extensive and expensive work for my daughter that he could have and he has repeatedly pushed off any work on my son’s mouth. It was a true pleasure working with Seth and his entire staff and would highly recommend him to all.

Laura R. from Manhattan, NY (Source: Yelp)


We had our consultation with Dr. Kleinrock this morning and I was extremely pleased by the efficiency of this office and the doctor’s genuine honesty.  I made the appointment about 10 days before the appointment and they were very accommodating and found the time that worked for me; then they confirmed the day before.  When we got to our appointment, the staff was very courteous and there was no wait.  Dr. Kleinrock is very pleasant and he honestly told me that my son does not really need the braces, which was a huge relief for me.  AND…. there was no charge for the appointment.  I will definitely be back with my other children when the time comes.

Lorraine P. from Rosedala, NY (Source: Yelp)


Dr. Kleinrock is a dental genius!! I had braces many years ago but after getting them off, I failed to wear my retainer everyday.  Over the years, I developed a gap.  I went back to my old ortho and several other new ones, but they all gave me the same option, braces again.  This wasn’t an option for me.  On my first visit to Dr. Kleinrock, he was able to make me a retainer which closed the gap in only one week!!  My Mom and I kept saying how amazing it was that it closed so fast.  I am so grateful to have a perfect smile again.  He also made me a retainer to wear to ensure that the gap stays closed.  Kudos to Dr. Kleinrock and his amazing team!!

Cassandra Lapuz (Source: Google)


I highly recommend Dr Kleinrock and his team in Kleinrock Orthodontics. They were all very nice, professional and approachable. Me and my family especially Margaret are so grateful for helping her throughout the two years journey in fixing her teeth and making it possible to gain her confidence. Most importantly her happiness and contentment by showing a big smile on her face which obviously tells how she really feels great. Thank you so much for your help and kindness. More blessIngs to you Dr. Kleinrock and to all your team and families.

Ida S. from Baldwin, NY (Source: Yelp)


Had an amazing experience with Dr. Kleinrock and his incredible staff! Never waited, staff was always pleasant and knowledgable. He was an absolute pleasure to work with and visits were always quick and the end result was amazing! Couldn’t be happier. I highly recommend using his practice for orthodontics!

DeeDee W. from Atlanta, GA (Source: Yelp)


I got the opportunity to get braces and after doing some research I found Dr. Kleinrocks office and went in for a free consultation. In and out , so simple and straightforward. He looks at everything and gives you the best options, his opinions and informs you on best practices. I had to remove some teeth elsewhere before I started the process so it took a few months before I was ready but on day 1 they are all so thorough! A year and 5 months later (how long I wore my braces under his care) The staff is so friendly, everyone is always there for your questions, no matter how silly the questions may sound.(I once called in to make sure my tooth wasn’t going to fall out because it was shaking which I found out is normal ) Short wait times are a major plus! Dr. Kleinrock really knows his craft. No matter how many patients he has in a day, he is always cheerful and smiling, making you feel comfortable, while remaining so professional. I moved to the south a year into the process and figured it would affect my progress. Dr. Kleinrock accommodated me and spaced out my visits, so whenever I was back in town I could come in. So many good things to say about this office, I give them all five stars though and highly recommend Dr. Kleinrock for all your orthodontic needs! Best investment I ever made. I finally got them taken off yesterday after only a year and 5 months and my teeth are sooooo beautiful.

Manny Akim (Source: Google)


Facilities: Extremely clean and organized, lots of room and plenty of seats. Staff: The BEST staff that I’ve ever met, so friendly and caring. Dentist: Kleinrock is great and friendly guy, very patient and understanding. He works with you and addresses your concerns. My Experience: Visiting Kleinrock every 4 to 6 weeks for almost 3 years, each time visiting, the staff has always been helpful and friendly. I’m always greeted with a “Hi, how are you?”. I felt welcomed in their facility, everyone is so nice. My only negative is when this place is busy, good luck finding parking, lot size is small but there’s parking on the street. Final Thoughts: I thank you so very much for all him and his staff has done. Kleinrock turned me from a Monster to a decent looking smile. I’d recommend him to anyone, best in Long Island as far as I’m concerned.

Gabriella Costanza (Source: Facebook)


Most AMAZING results from my invisignln! Couldn’t be any happier with my new smile! Thank ypu so much Dr. Kleinrock & a big thank you to your amazing staff, always making my appoiontments so quick and pleasant. 5 STARS for my overall experience.

Erin G. from Lawrence, NY (Source: Yelp)


Amazing, amazing practice.  Dr. Kleinrock an his staff are the absolute best.  My son, niece and nephew all used Dr. Kleinrock for their braces. My son wore his for 4 years and had them removed this morning. His teeth came out great! The office staff couldn’t be nicer, the ease of making appointments can’t be beat. Always accommodating, always wonderful! Thank you for everything!

Lilith Colon (Source: Google)


Dr. Kleinrock was highly recommended by my dentist and others living in the Long Beach community. I am so happy that I followed their recommendation. I loved his sports themed office. There are gaming systems for kids to play. His staff is always professional and accommodating when scheduling appointments. Most importantly, Dr. Kleinrock did fabulous work on both of my daughters. His meticulous work has left them with a beautiful smile. I highly recommend Kleinrock Orthodontics.

Lana S (Source: Google)


LOVE Dr. Kleinrock and his awesome staff!! Kind, helpful and super knowledgeable about his craft, Dr. Kleinrock adjusted my teeth and gave me a new smile that I love!! Whats more, every single person on his staff is warm, friendly and welcoming…I’ll honestly miss seeing & catching up with those ladies now that my treatment has come to an end. 1 great doctor + 1 amazing staff = 5 bright stars!

Rowan M. from Norristown, PA (Source: Yelp)


Thank you Dr Kleinrock.  I’m one of those dentist-phobes, and while that means i brush like crazy, it means I never had braces and really needed them.   Somehow you got me over that and I can’t thank you enough.  We started my invisalign treatment when I was 38 and its given me a brand new confidence.  Your office staff are fun and supportive, and we always feel welcome.  I’m even happier that you’re able to just look at cellphone pictures sometimes instead of me coming in.  Very convenient and helpful.

Patty C. from Oceanside, NY (Source: Yelp)


Our family has been a patient of Dr. Kleinrock for more than 10 years. Our 3 kids all had a very positive experience with great results. Dr. Kleinrock and Dr. Z are very caring and patient and have done an exceptional job especially with our son who has Down Syndrome. The staff are all very personable and professional. I can’t say enough good things about Dr. Kleinrock, Dr. Z and their amazing staff. Thank you for all you have done for my family! Patty C.

Barb Hvidsten (Source: Facebook)


Kyle got his braces off today and I could not be any happier with the results. Dr.Kleinrock and Dr.Zeppieri are just amazing. I can not thank them enough for the great job that they did. Along with these amazing doctors is a great staff. There was never a time when I called or went into to an appointment and was unhappy. Always greeted with a friendly smile and not one of them will hesitate to answer any or as many questions as you can ask. I They make you feel more likea friend then a patient. I l am excited to start the journey over again with my daughter now.

Adam Hawkbird (Source: Google)


My experience with Dr. Kleinrock was has been nothing less than exceptional… After decades of dealing with an open-bite, it was time to pursue corrective measures through orthodontics, particularly with Invisalign. Dr. Kleinrock was my third, and final opinion. After visiting Dr. Kleinrock’s Hewlett location, there was no need to look any further. Upon entering his office, I was immediately impressed by the impeccable cleanliness and modern equipment. The staff, who I have since developed personal and friendly relationships with, were extremely attentive with my questions regarding insurance, instructions with my Invisalign, comfort and satisfaction. There has NEVER been a wait of more than a minute or two to see Dr. Kleinrock, who has always, and continues to greet me with a smile. He is very friendly and professional. I have never felt pressured to move forward with a procedure, but clearly, after having been treated by him for over a year, it was the right way to go. My bite is now perfect. Between appointments, throughout my experience with Dr. Kleinrock, I have reached out to him by phone with concerns and he has always given me adequate time to answer my questions thoroughly. Clearly, he takes pride in his work. In the near future, I will probably be bringing my daughter to see him for a similar protocol. Fortunately, I have had the opportunity to experience his services before I trust my child with his practice. I have full confidence in his ability. It may seem funny, but I’m somewhat ambivalent that my treatment is coming to an end, because although I am glad to be finishing up with Invisalign, I am sad to finish up with Dr. Kleinrock.

Aikea Hassell (Source: Google)


I got my braces put on mid 2015 and Dr. Kleinrock and his amazing staff have been absolutely great to me! They work with you as best as they can. There’s nothing like having a doctor who still understands humanity and isn’t a penny pincher! I am very thankful to have been his client and happy to say after three long stressful years, my braces are finally coming off! The other day I lost my retainer and they quickly got me an appointment to replace it. I go to the Long Beach office for my appointments but in some cases I need to go to the Hewlet office for whatever reason and it is the same warm and welcoming atmosphere. What i love most about them is that they know their patients. They ask you about your day and make sure you’re comfortable. I’m sad that my braces will be off soon because the staff is just beyond great!!! Although, I definitely recommend Dr. Kleinrock for all your orthodontic needs! Adults, teens, and children all are welcome and are treated respectfully with a warm smile from everyone. If I could leave 10 stars I would!!! Thank you Dr. Kleinrock and staff!!

Maggie Dash (Source: Google)


My Family and I absolutely LOVE Dr. Kleinrock and Team. When you go for a visit, it always feels like you are coming to see your Family. They are beyond friendly, supportive and most importantly “efficient”. The Staff consistently go above and beyond to make sure our Son have a wonderful experience thus why he always look forward to his scheduled visits. Dr. Kleinrock is a Genius and he is “Magic”. WE thank you and your Ahhhhhmazing Staff for all that you do!

Arianna Lee (Source: Google)


I got invisalign for my wedding and from the beginning Dr. Kleinrock worked with me based on my wedding timeline. He was always available directly to answer any questions I had. My teeth are straighter and look better than they ever did in my whole life! I am so happy with results. I HIGHLY recommend Dr. Kleinrock and his staff! Everyone is so friendly and always willing to work with my schedule (I commuted from the city and everyone was always understanding). It is not often you find a doctor these days that actually cares and invests in you. Great orthodontist, Thanks Dr. Kleinrock!!

Rosenberg Rodriguez (Source: Google)


We had our consultation with Dr. Kleinrock this morning and I was extremely pleased by the efficiency of this office and the doctor’s genuine honesty. I made the appointment about 10 days before the appointment and they were very accommodating and found the time that worked for me; then they confirmed the day before. When we got to our appointment, the staff was very courteous and there was no wait. Dr. Kleinrock is very pleasant and he honestly told me that my son does not really need the braces, which was a huge relief for me. AND…. there was no charge for the appointment. I will definitely be back with my other children when the time comes.

Heather Remsen (Source: Google)


Dr. Kleinrock and his staff have helped me through my journey since 2007 when I first came to him for braces. The team at Kleinrock Orthodontics goes above and beyond to accommodate my busy schedule, meet my individual needs and address any concerns I have. Dr. Kleinrock has over 30 years of experience and the results clearly reflect that. I went through braces a second time following a jaw surgery and I couldn’t be happier with my straight, beautiful smile that I have waited so long for– 12 years to be exact. I highly recommend this practice for any orthodontic work. THANK YOU DR. KLEINROCK!!!!

Shira Lippman (Source: Google)


Today I started my Invisalign treatment and it was a fantastic experience. As a general dentist myself, I can appreciate the way Dr. Kleinrock explains everything clearly, works gently and efficiently. I already knew how terrific he was with children because my three daughters have been happy patients of his for some time. But after today, I can personally attest to the fact that he is also fantastic at treating adults who want to straighten their teeth. Dr. Kleinrock, as well as his amazing staff, have always been most accommodating, professional, and warm. I refer all my patients for orthodontic treatment to Dr. Kleinrock, and will continue to do so. I highly recommend his office. Great place to be!

Nicole Saladino (Source: Google)


I’ve always had a gap between my front teeth and I was always self conscious about it. I knew I needed to get it fixed before I got married. I am SO GLAD I chose Dr Kleinrock, within a few months he had my teeth looking amazing. Dr Kleinrock and his staff are very accommodating with scheduling, kind and genuinely caring. I always look forward to my visits because they are so easy and quick. Dr Kleinrock fixed my teeth with Invisalign, they look so perfect now! he told me what to expect at every moment so I had no surprises. I can never thank him enough for a life changing experience !

Krissy S. from Oceanside, NY (Source: Yelp)


I’ve been shopping for an orthodontist for awhile and went to four before I found Dr. Kleinrock. His team is like a cheerleading squad, and made the steps to get Invisalign fun. Dr. Kleinrock himself is very honest, very detailed and patient. I really liked that he spent the entire hour on my first evaluation explaining the Invisalign process and answered my questions…not his assistant. Yesterday my Invisalign was put in and it was gently done all while Dr. Kleinrock and his assistant guided me through the entire process and also made me laugh and feel comfortable. Besides his fun staff, and personalized attention the facility is clean, and there is parking. I highly recommend Dr. Kleinrock and his team to anyone!

SG F. from Baldwin, NY (Source: Yelp)


My daughter just got her braces off today and WOW!!! do her teeth look GREAT! “Chiclets” are an understatement!! Thank you sooooo much, Dr. Kleinrock, for your amazing orthodontic talent. Words cannot express how pleased I and my daughter were with your work, the proficiency of your staff and your office as a whole. We both give you two thumbs up, for sure!! Thanks again! I’ll certainly “tell two friends”! 🙂 Saundra Gardner, Esq.

Ann Marie Barbarotta (Source: Facebook)


It never occurred to me that I would be getting braces in my late 50s It all started when I began bringing my son for braces four years ago. Month after month of visits to Dr. Kleinrock and seeing the excellent progress being made with my son’s teeth as well as countless others of all ages, I realized that I too could benefit from Dr. Kleinrock’s skilled work. A simple evaluation followed by an invisalign series, led to a beautiful smile. Better than botox and the results last a life time. Thanks Dr. Kleinrock and your fabulous staff.

Carl Judd (Source: Google)


One of the most honest orthodontists around. We brought our two sons to Dr. Kleinrock for a second opinion when they were ages 10 and 12. We were originally told by another orthodontist that both my sons needed their teeth pulled and braces put on. After consulting with Dr. Kleinrock, he looked at the x-rays and told us that we should wait until their baby teeth fall out and it was quite possible they may not need braces. We took his advice and followed up with Dr. Kleinrock two years later. Sure enough he was right, our older son’s teeth grew in straight and did not need braces. Our younger son did need them but no teeth needed to be pulled. We eventually brought our youngest to Dr. Kleinrock and she too needed braces. Both of our kids’ teeth look great! The service he provides is well above par. He has a cordial attitude, he makes our children’s visits a pleasant one, he is prompt, rarely a wait and his staff is very friendly & accommodating.

Stacey R. from New York, NY (Source: Yelp)


I visited Dr. Kleinrock in June 2012. I had a drastic anterior open bite. Since starting the braces treatment I have had great results to date. Dr. Kleinrock has great bedside manner and the staff is extremely pleasant to interact with. I am seen shortly after I arrive and my visits are very quick. I was losing hope that I would ever be able to have a beautiful smile but thanks to Dr. Klenrock he made that possible. I recommend him to everyone. Dr. Kleinrock’s vast knowledge and experience shines through his work. The decor of both offices is very nice. I love how they cater to children with the video games in the waiting room, academic achievements and contest.