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Mastorakos Orthodontic Associates Welcome to Mastorakos Orthodontic Associates, conveniently located in St. Louis, Missouri. Dr. William L. Mastorakos is proud to offer high quality orthodontic care for the entire family in a state-of-the-art, warm and friendly environment. We offer a wide range of orthodontic treatment options to meet the needs and desires of each individual patient, including traditional appliances, metal and ceramic braces, and Invisalign.

Invisalign is designed to gradually improve your smile using a series of clear, customized aligners.
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Orthodontics is the branch of dentistry that specializes in the diagnosis, prevention and treatment of dental and facial irregularities.*. The technical term for these problems is "malocclusion, " which means "bad bite." The practice of orthodontics requires professional skill in the design, application and control of corrective appliances, such as braces, to bring teeth, lips and jaws into proper alignment and to achieve facial balance.
Bill as he is affectionately known to his patients and staff, prides himself in not only providing clinical excellence in orthodontic treatment but also in creating lasting relationships with his patients. The professional yet friendly atmosphere of his office makes you feel comfortable immediately.
We know that our office is only as effective and as welcoming as the people who work in it, which is why we take pride in our friendly and well-trained team members! We put your needs first to achieve efficient and comprehensive treatment in a supportive and nurturing environment. We promise to speak candidly with you about possible treatments as well as any risks and associated costs of treatment, and how treatment can address your individual needs.Our staff is uniquely trained and highly skilled, and we strive to provide unparalleled service to each patient.
This is a one-of-a-kind, world-class operation where we pride ourselves in not only providing clinical excellence, but also in creating lasting personal relationships with our patients. The friendly atmosphere of our office immediately makes people feel comfortable. We put smiles on faces! Our office has adopted the Marshall Field & Company idea: "To do the right thing, at the right time, in the right way; to do some things better than they were ever done before; to eliminate errors; to know both sides of the question; to be courteous; to be an example; to love our work; to anticipate requirements; to develop resources; to recognize no impediments; to master circumstances; to act from reason rather than rule; to be satisfied with nothing short of perfection."
Reviews (10)
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Rebecca Lay
Jun 22, 2022
Dr. Bill has vast experience and knowledge. He is the only one I would trust with my children's challenging mouth situations. He has a wonderful bedside manner and explains the process every step of the way. The entire office is friendly and helpful. Highly recommend!
Toajish
May 15, 2022
Dr. Bill and his team are professional and kind. They have the best customer service. So glad we sent our kids here.
Jill Moore
Apr 23, 2022
AMAZING experience! Dr. Bill is fantastic. Every person in the office from check in to X-rays to plan overview & checkout is beyond amazing! Can't say enough about how the crew at Mastorakos knocks it out of the park. They make your kid feel like a superstar & I'm so confident in the plan for my kiddos teeth. Best service I've had anywhere in years!
Deborah Minaird
Jan 16, 2022
The MASTORAKOS ORTHODONTIC SERVICES is EXTRAORDINARY over the top! All patients, receive A++ 360 care in every way!
Angela Brake
Oct 25, 2021
An outstanding group of people! Everyone is so nice and very professional. Dr. Bill has a wonderful chair side manor and is very detailed in the treatments that he is offering. 10 Stars!
Dr. Marquart
Oct 16, 2021
Had a great first check up. The nurse and doctor were both patient, kind, and valued client education. I was very grateful for their level of care and have full confidence in their recommendations for my son.
Polly Hartman
Jun 25, 2021
Amazing, simply amazing. Dr. Bill and his team are the best! Each and every one of them genuinely cares for their patients. Everyone is so upbeat and they make every appointment like a family gathering. Dr. Bill's expertise in the field is bar none! If you want the best then Dr. Bill and his staff is IT! A "Mastorakos Smile" is the only smile anyone should be wearing.
Harriet K.
Apr 16, 2021
I just got my braces off today and I am thrilled and happy beyond belief. Dr Bill and all his beautiful staff are kind, professional and practiced extreme patience with me as I asked every week "when are these coming off". I'm 57 years old but my teeth look 37! I made the best investment in myself and can't say enough about Mastorakos Orthodontics. Dr Bill is an artist orthodontist. Thank you!
Jason Cox
Jun 02, 2019
I have both of my sons seeing Dr. Bill. He is absolutely wonderful with the kids. He took his time to explain everything to us and anytime we have questions he never rushes you. He knows my name and my wife's and really cares about his patients and their family. The front desk staff is friendly and also genuinely vested in my kids care. They celebrate little milestones with you as your kids smile becomes amazing along the way. Most of my friends kids see Dr. Bill.
Erin Stack
May 03, 2018
My sisters and I were all patients of Dr. Bill (and his incredible father Dr. Leo) in the late 80s. When it was time for my daughters to see an orthodontist, it was no question who I would send them to. The atmosphere at MOA is a perfect balance of inviting, fun and professional. From the moment you enter the office, the incredible staff greats you with excitement.

They are attentive to each individual and take time to genuinely get to know you. They know every patient by name (and likely what sport you play, how many dogs you have, and your favorite book). Christa, Stephanie, Carol, and Jessica are an absolute joy to be around. Most people dread an orthodontic appointment - this amazing staff makes you look forward to the next visit. Dr.

Bill is a perfectionist - a quality I highly value in an orthodontist. He is thorough in his explanation of his treatment plan. He focuses on each individual, giving them the attention as if they were his only patient. He takes time answering any questions and offering assurance to the patient (and the individual paying for the treatment). He confirms that everyone is confident with the treatment plan before you walk out the door. He enjoys his work and this is evident in the way he interacts with his patients and his staff. I recommend Dr. Bill and MOA to everyone I know.