Our Orthodontic Practice In Wilmington & Newark, DE

Patients Love Us & Doctors Trust Us

Our Practice

What Sets Us Apart

Our office experience is unlike anything you’ve ever imagined an orthodontic office could be. We use advanced techniques delivered with gentle, kind hands because we are committed to making your orthodontist experience the best possible.

Dr Yi
Brand Logo
Brand Logo

Get to know us

Meet Our Doctors

We don’t have regular staff and doctors, we have GREAT staff and doctors who have a tremendous passion for both the profession and patients. We love what we do, and we do it in a way that nobody else does. We can’t wait to meet you soon!

Dr Yi

Dr. Leah Yi

Dr. Yi comes from a family of orthodontists and dentists and cherishes the ability to enrich patients’ lives by creating beautiful smiles. She likes tennis, plays the cello, and has a shameless addiction to hot Cheetos.

Meet our team

Get to Know Us

Our experienced and talented team is committed to working with you and your family to create a comfortable, stress-free, and rewarding orthodontic experience every time you visit our practice. We are here to support you in any way we can throughout the entire process. We’ll hug, dance, and high-five you. Nobody does it better. Period.

Happy New
G&N Team Members

what to expect

Tour Our Offices

You will be greeted by one of our treatment coordinators who will help guide you through the new patient process. It all begins with a tour of our office and an introduction to our staff (we want you to know all of our fabulous team members).

Your orthodontist will meet you in a large, quiet, private consultation room. A thorough exam will be performed along with a review of your records. Ample time is scheduled for the orthodontist to review his/her findings with you. Our treatment coordinator will then review the details of treatment with you and answer any questions you may have. 


State-of-The-Art Care

Your smile is our priority! To best serve you, we use only the most advanced technology and treatment techniques to ensure more accurate results and a comfortable and seamless orthodontic experience.



The iTero scanner is designed to replace the older and slower methods for creating models of your smile. With iTero, the impression part of the treatment planning process is now more accurate and more comfortable than ever.At Greeley & Nista Orthodontics, you can say goodbye to messy molds!

In-House Retainers

In-House Retainers

Not only can we use the iTero Scanner to project your desired results, but our 3D printing technology allows us to print your aligner-style retainers here in the office, directly from the iTero model.

3D Cat Scan

3D Cat Scan

This allows our team to take more detailed scans of your smile. The more insight we have into the layout of your smile, the more informed treatment decisions we’ll make.