First Aid For Braces

Experiencing minor discomfort with your braces? Some problems can be easily remedied at home, without a visit to the orthodontist.

Read More

Before & After Smiles

Your smile is one of your greatest assets. Check out our stunning before-and-after results to see how we can improve your teeth.

View Smiles


Don’t wait another day for the smile you’ve always wanted. Find out what O’Neill Orthodontics can do for your pearly whites.

Schedule Today

Our Hours

Monday - Thursday8am - 5pm
Select Saturdays8am - 5pm

Why Choose Us?

At O’Neill Orthodontics, we help our patients to be confident with their smile.
Our office is conveniently located to serve Southern York County, Pennsylvania and Northern Baltimore County, and Harford County, Maryland.

We want the best outcome for you!


Dr. Nancy O’Neill and her team are enthusiastic about helping patients achieve their goals. Our practice offers several orthodontic treatments designed to give you the most comfort and convenience.

  • Braces for children and adults
  • Two-phase treatment
  • Invisalign
  • Jaw and Bite Correction
  • Snoring & Sleep Apnea Appliances
  • Teeth Whitening after treatment
Learn More about O'Neill Orthodontics

Welcome To Our Office

We are a family here at O’Neill Orthodontics and welcome you to our office.



Whether you’re a long-time patient or new to our office, we love hearing your feedback. Read what our current patients are saying about us.

I smile more now! I’m more confident with my teeth and I like the way I look.

Gabe, Braces Patient

The atmosphere is unique in itself with the barn.  And the loft is a great alcove for your parents to hangout and watch from above.

John, Braces Patient

I have a beautiful smile. My teeth are straight. I have more confidence than I’ve ever had before.  O’Neill Orthodontics is a warm friendly place.

Bill, Invisalign Patient

I’m very confident in laughing and smiling a lot and being myself.

Evan, Braces Patient
View All Testimonals