About OASECT | Get To Know Our Orthodontic Team

At OASECT, orthodontics is about more than just straight teeth. It’s about giving our patients the confidence to shine. For over 65 years, we’ve served families across southeastern Connecticut with two convenient locations in Waterford and Norwich. Whether you’re exploring treatment for your child or yourself, our experienced team is here to make your orthodontic journey feel easy, rewarding, and fun.

With state-of-the-art technology, personalized treatment plans, and a warm, welcoming atmosphere, OASECT is proud to be the trusted orthodontic partner for generations of families. Our patients leave our practice with a boost of confidence that lasts a lifetime.

What Sets Us Apart

We blend advanced tools with a genuine, people-first approach to orthodontics. From Damon™ self-ligating braces and clear aligners to virtual monitoring and impression-free 3D scanning, we make your care efficient, modern, and comfortable.

Our team believes that visiting the orthodontist should be the best part of your day, and we strive to make that true for every patient.

Trusted Invisalign^® and Spark Aligner Providers

As a Platinum Invisalign® Provider and certified Spark aligner partner, OASECT stands out as a clear aligner leader in Connecticut. Our orthodontists tailor treatment to fit your lifestyle and goals—whether you’re considering clear aligners for yourself or your child.

Meet Our Orthodontists

Our orthodontists bring decades of experience, clinical expertise, and a true passion for creating smiles. They walk in our patients’ shoes as patients themselves, and that empathy drives every interaction.

Dr. James O’Leary

DMD

Dr. O’Leary brings a meticulous, patient-centered approach to every smile transformation. Known for his dedication to quality care and cutting-edge techniques, he has become a trusted name in orthodontics across the region.

Dr. Gregory Hack

DDS

Dr. Hack is committed to delivering confident smiles through personalized care and modern solutions. He has helped countless patients feel comfortable and confident throughout every phase of treatment.

PATIENT TESTIMONIALS

Hear from Our Patients

With hundreds of five-star reviews and countless stories of smile success, OASECT has built a reputation for excellence in orthodontic care and patient satisfaction.

    
 
 
       
   Kailey Seals 
 
 
 Trustindex verifies that the original source of the review is Google. I really enjoyed this experience. All the employees were so kind and informative.
  
 
      
   Katherine Velazquez 
 
 
 Trustindex verifies that the original source of the review is Google. I definitely recommend them. They are very attentive from the door to the doctor and nurse. They are very friendly and with a lot of patience
  
 
      
   Kaitlyn Grzyb 
 
 
 Trustindex verifies that the original source of the review is Google. I was so very nervous when I first came in for my consultation. Everyone was so nice and welcoming and not pushy. I decided to go with Invisalign and I’m so glad I did!! I now have a perfect smile and actually don’t hide it when I have my photograph taken!
  
 
      
   Ronsy Perez 
 
 
 Trustindex verifies that the original source of the review is Google. Everyone was super nice and welcoming, my assistant was great and made me comfortable the whole time & the dr was very nice and efficient!
  
 
      
   david vanasse jr 
 
 
 Trustindex verifies that the original source of the review is Google. From my initial consultation through today’s application of Invisalign, I can’t say enough as to how pleased I am. The person who set my Invisalign in place today was very professional and informative.
  
 
      
   Nicole Gal 
 
 
 Trustindex verifies that the original source of the review is Google. Quick professional friendly
  
 
      
   Bethany Duval 
 
 
 Trustindex verifies that the original source of the review is Google. Everyone who works at OASECT is happy, kind, and excellent at their jobs! I am so happy with how my smile looks now! 😁
  
 
      
   Terri Cunha 
 
 
 Trustindex verifies that the original source of the review is Google. Fabulous experience, thank you for taking care of our little guy!
  
 
      
   Chelsea Wydler 
 
 
 Trustindex verifies that the original source of the review is Google. What a wonderful experience my daughter had with OASECT. They were always so kind and made my daughter feel most comfortable throughout the entire process. Professional, efficient and clean.
  
 
      
   Jesse Vendley 
 
 
 Trustindex verifies that the original source of the review is Google. Beautiful facility. Cutting-edge equipment. Prompt, friendly, expert service. Everything you could want. Highly recommended!

Visit Our Offices in Waterford and Norwich, CT

From your first consultation to your final smile reveal, our goal is to exceed your expectations at every step. We make orthodontics approachable, accessible, and genuinely enjoyable.

OASECT is here to help you smile brighter with orthodontics for all ages. Schedule your free consultation today to discover how orthodontics can change your life!