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West Covina, CA

Discover your best smile with world-class orthodontics
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Personalized experience

1:1

Doctor-led care

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Smile makeovers

"Even as a first time ortho patient, I felt the treatment plan was well thought out and precisely moving my teeth without causing excessive pain."

Board-certified orthodontist

Dr. Namgu Kim

After years of working in high-volume orthodontic practices, I realized something was broken. Patients were being rushed through appointments. Treatment plans felt cookie-cutter. And the artistry of creating truly beautiful smiles was being sacrificed for revenue. When the opportunity came to open my own practice in West Covina, I knew this was my chance to do things differently. This community deserves an orthodontist who takes time to listen, who sees every smile as a unique masterpiece, and who refuses to compromise on results and experiences.

One Smile Orthodontics isn't just a business - it's my commitment to this community. Our patients will get my personal attention, my years of training and expertise, and a smile transformation that exceeds everything you hoped for.

Because you only get one smile. Let's make it extraordinary.

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Advanced treatments for every smile

Invisalign®

Discreet and comfortable, Invisalign® offers a flexible path to a confident smile—without brackets or wires.

Braces for all ages

Whether you’re looking for clear ceramic or traditional metal, we personalize every case to create beautiful, functional results.

Airway Orthodontics

Focus on improving the health and function of your airway by using customized treatments that not only straighten teeth but also promote better breathing, sleep, and overall well-being, making it a holistic approach to orthodontic care for both children and adults.

Damon braces

Damon Braces are a modern orthodontic option that use self-ligating brackets to gently move teeth into place without the need for traditional elastic bands. This system allows for a more comfortable experience with fewer adjustments and faster treatment times.

Orthodontic care that helps you see what’s possible

At One Smile Orthodontics, we’re here to help you achieve the smile you didn’t know you could have. Whether you're a teen, parent, or adult finally ready to do something for yourself, you’ll find personalized, aesthetic-driven care that’s designed to elevate your confidence and your life.

Not sure if Invisalign® is right for you?

Take a minute to tell us about your smile goals, and we’ll let you know if Invisalign®—or another option—is the best fit for your needs. No strings attached.

Fill out a short form to find out if you're a candidate

Why patients choose One Smile Orthodontics

A doctor with an artist’s eye

Not every orthodontist is trained to see aesthetic details—but Dr. Kim is. He believes beauty matters, and he's on a mission to show patients what’s truly possible when orthodontics is done with vision and purpose.

Built for confidence, not just straight teeth

We’re not just lining up your bite—we’re helping you walk into rooms with confidence. Our approach focuses on both form and function to transform the way you feel about your smile.

Personalized experience

From day one, you’ll experience attentive, one-on-one care. No cookie-cutter treatments. Just thoughtful planning, custom solutions, and a partner in your smile journey.

Multicultural care for a diverse community

With language and cultural understanding across Korean, Chinese, and Hispanic communities, we’re proud to serve West Covina’s diverse population with respect and intention.

Real smiles.
Real stories.

If you are an adult patient who is considering a ortho treatment that you've been thinking about for your entire life, I highly recommend Dr. Kim. I was initially nervous about the process but Dr.Kim was very attentive and took time to come up with the plan that will address my concerns so I decided to start the treatment. My two main concerns were crowded lower anterior teeth and narrow upper jaw. Before starting the treatment, Dr. Kim clearly explained the treatment plan and timeline, which helped alleviate my concerns. Since I didn't want to wear the palate expander, Dr. Kim came up with alternative solution that can be done with Invisalign. Even as a first time ortho patient, I felt treatment plan was well thought out and precisely moving my teeth without causing excessive pain. I'm currently done with my initial treatment and waiting for refinements sets but I'm already very happy with the results so far. One Smile Orthodontics truly lives up to its name.

Yubin S.

I don't normally leave reviews, but after visiting Dr. Namgu Kim I feel compelled to share it.

I went for a consultation about possibly getting braces or Invisalign, and as someone who always had a lot of anxiety around dental visits, I was honestly nervous walking in. But the moment I met Dr. Kim, I felt at ease. He has a reassuring presence and a genuine way of listening that makes you feel cared for as a patient -- not rushed, not pressured, just understood.

Dr. Kim took the time to thoroughly examine my teeth, explain what he was seeing, and walk me through my options in a way that was clear and easy to understand. He pointed out details that other dentists had overlooked and laid out a step-by-step plan that made me feel confident about what comes next. He focused on what would genuinely serve my needs and comfort level. As someone with dental anxiety, that meant a lot. For the first time, I felt like I was in the hands of a specialist who really prioritized my well-being.

If you're considering orthodontic treatment -- Invisalign, braces, or even just a professional opinion -- I cannot recommend Dr. Namgu Kim highly enough. His expertise is exceptional, his communication is clear, and his compassion is unmatched. I walked out feeling informed, supported, and surprisingly excited about the next steps. Thank you!

Nick L.

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