Amazing Smiles Orthodontics | St. Louis, O'Fallon, Glen Carbon
7171 Delmar Blvd., Suite 201 University City, MO
2220 S State Route 157 Glen Carbon, IL
4905 Stone Falls Center Dr. O'Fallon, IL
What Sets Us Apart
At Amazing Smiles Orthodontics, we work with patients of all ages to help create smiles that change lives. We recognize that every smile we treat is unique. Dr. Mastroianni works with you to create a personalized treatment plan that meets your needs and fits your lifestyle. We go the extra mile to answer any questions you may have, and provide you with several options so that you can make the right choices for your treatment. Dr. Mastroianni offers a variety of orthodontic treatments, including Invisalign, Invisalign Teen, self-ligating braces, TMJ and headache treatment.
First Visit
Meet Dr. Mastroianni
Same Day Braces
Invisalign

Dr. Mastroianni is an Elite Invisalign Provider, which means that he is among the top 1% of all Invisalign providers. All patients get the benefit of his years of experience treating thousands of patients, but all personalized care and treatment by Dr. Mastroianni and his staff.

Learn More

Patrick K.

Our experience with Dr. Jeff and his team at Mastroianni Orthodontics has been amazing. The doctor and staff are very knowledgeable, and they go out of their way to make each visit remarkable. My daughter was very nervous about getting braces, but after her first visit she came home smiling, proud of her braces. I never hesitate to recommend Dr. Mastroianni to anyone needing braces. He's the best!

Patrick K.

2018-01-03T16:09:06+00:00

Patrick K.

Our experience with Dr. Jeff and his team at Mastroianni Orthodontics has been amazing. The doctor and staff are very knowledgeable, and they go out of their way to make each visit remarkable. My daughter was very nervous about getting braces, but after her first visit she came home smiling, proud of her braces. I never hesitate to recommend Dr. Mastroianni to anyone needing braces. He's the best!

Trish C.

I am so impressed with Mastroianni Orthodontics. I've been concerned about my 8 1/2 year-old son's baby teeth falling out and permanent teeth coming in crooked. I called Mastroianni Orthodontics and asked if my son was too young to be screened for braces, as I wanted to catch any problems early. The staff members answering the phone were friendly, knowledgeable, and explained to me that most kids should be screened by 9 or 10. So, I was on target. They also explained to me - to my shock and surprise! - that my initial visit, exam and x-ray for the screening was free of charge.

Trish C.

2018-01-03T16:09:58+00:00

Trish C.

I am so impressed with Mastroianni Orthodontics. I've been concerned about my 8 1/2 year-old son's baby teeth falling out and permanent teeth coming in crooked. I called Mastroianni Orthodontics and asked if my son was too young to be screened for braces, as I wanted to catch any problems early. The staff members answering the phone were friendly, knowledgeable, and explained to me that most kids should be screened by 9 or 10. So, I was on target. They also explained to me - to my shock and surprise! - that my initial visit, exam and x-ray for the screening was free of charge.