Compassionate Orthodontic Care Close to Home

About Weldon Orthodontics


Weldon Orthodontics is proud to offer family-oriented orthodontic care in a warm, welcoming environment. Located in Weldon Spring, MO, we serve patients of all ages across St. Charles County. As a local orthodontist office, we are committed to making you and your child’s experience with us positive and even fun. Our experienced staff is professional and caring, ensuring each patient’s visit is comfortable from start to finish.

Creating Beautiful, Long-Lasting Smiles

Making St. Charles County Smile

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Why Choose Us?

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Treatment for the Whole Family

Whether you’re 7-years-old or 70-years-old, we have a treatment plan personalized for you. We proudly serve patients of all ages, catering our services to your specific needs.

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Affordable Payment Plans

We understand that orthodontic treatment can be expensive. But we believe everyone deserves a smile they can be proud of. That’s why we offer affordable payment plans starting as low as $300.

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Same-Day Starts

Why wait for a more beautiful smile? At Weldon Orthodontics, you don’t have to. You can begin treatment at our office as early as the same day as your initial consultation.

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State-of-the-Art Technology

We are committed to offering the most cutting-edge treatment using state-of-the-art technology. Our office is equipped with the latest x-ray units and digital scanners.

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Free Consultations

Weldon Orthodontics offers free orthodontic consultations! That’s a $250 value at no cost to you. There’s nothing in the way between you and learning more about how we can elevate your smile.

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Ready to get started?

To schedule a free consultation, please contact us at 636-244-4052 today!

Dr Mariel Cotton | Weldon Orthodontics, Weldon Spring MO

Meet Dr. Mariel Cotton

Mariel Cotton, D.M.D. & M.S.D.

Dr. Mariel Cotton graduated in 2010 with her bachelor’s degree in science and business from the University of Notre Dame. From there she attended Dental School at Southern Illinois University and graduated Cum Laude. She then expanded her dental expertise by completing an orthodontic residency at the University of Colorado followed by an Aligner Intensive Fellowship.

Dr. Mariel Cotton

Dr. Cotton decided to become an orthodontist because it is the perfect blend of art, science, and helping others. She was inspired by her grandparents who instilled in her the importance of finding beauty in all things and to love the creative process. Her parents also played a major role in her decision by both being in the medical field. This taught her to always be curious and to never stop learning. Being an orthodontist allows her to achieve all these things and more.

As an orthodontist Dr. Cotton is passionate about being a part of her patients’ smile journey. She especially enjoys early treatment and clear aligner therapy because of the creative challenge this treatment provides. She loves that she is not only able to improve her patient’s oral health, but also their confidence through orthodontic treatment. Her central goal is to make her patients feel at ease and excited about their treatment. One thing she wishes she could tell every patient is that everyone deserves a beautiful and healthy smile that they love to share with others!

Dr. Cotton currently resides in the greater St. Louis area with her husband Zach and their 3 rescue cats. They decided to settle down here because they love being close to their family and friends. In her free time Dr. Cotton loves to read and spend time outdoors hiking and exploring national parks with her husband. So far, they have been to 17 national parks. An interesting fact about her is that she helped to reconstruct the skeleton of a triceratops while volunteering at the Burpee Museum of Natural History.