Dear patient and parents, we will start calling patients to schedule appointments on Monday May 18.


Welcome To Liu Orthodontics!




Beautiful , Confident Smile

Dr. Terry R. Wallen, DDS, MS


  • The most important thing is having good habits of brushing and flossing. We strongly encourage you brush your teeth after each meal. A team member will show you how to maintain good oral hygiene with braces. Keeping your braces clean can prevent cavities, gum disease, also white spot lesions. When gum swells due to poor oral hygiene, it will significantly slow down tooth movement and compromise treatment outcomes. Here is the link showing your how to properly clean your teeth and braces.


Breakage of braces will slow down your treatment. Avoiding certain food can help.

。Chewy foods - bagels, licorice
。Crunchy foods - popcorn, chips, ice
。Sticky foods - caramel candies, chewing gum
。Hard foods - nuts, hard candies
。Foods that require biting into - corn on the cob, apples, carrots


When you just get your braces on, you may notice that your teeth are sore. This is perfectly normal and will last for about 2 days. To relieve the discomfort, you may try taking an over-the counter pain reliever such as Ibuprofen. If you have a canker sore, we recommend dissolving one teaspoon of salt in eight ounces of lukewarm water. Swish and gargle this solution in your mouth for just a couple of minutes.

It is also not uncommon for your lips, cheeks, and tongue to become irritated for one to two weeks as they toughen and become used to the braces. We would be happy to give you some wax which can placed over the braces to lessen the tenderness and poking wires.


After Dr. Liu or Wallen complete the exam and evaluate your images, the doctor will either let you know if there is any issue or treatment may be recommended. We will discuss with all of your treatment options. This would us and you send time together to determine what will be the best treatment for you or your child. We encourage you to ask any questions or concerns you might have. We can let you know how long treatment may take, learn more about the procedures recommended, and what they are likely to cost. With your questions answered, you can begin treatment with confidence.

If treatment is not recommend at this time, we will set up follow up appointments to monitor tooth and jaw development. If you do have any questions or concerns before the scheduled check-up appointment, please give us a call. We would love to see you or your child as soon as possible.


Once finishing phase I treatment, braces will be removed. Patients usually wear retainers until all the permanent teeth erupt. Tooth eruption will be monitored. Dr. Liu or Dr. Wallen will see them usually every 6 months and supervise retainers wear or determine if removal of certain primary (baby) teeth is necessary during this break period.


The second phase is initiated after all permanent teeth have erupted for an average of 12-24 months. In the second phase, tooth position will be finalized and detailing using braces or clear aligners. A harmony, healthy, beautiful smile is created with balance of facial structures.


Retainers must be worn after this phase to ensure you retain your beautiful smile. At Liu Orthodontics, we usually use upper clear retainer and lower fixed retainer with or without clear retainer. It is very important for you to wear your retainers as instructed. Otherwise, teeth will move back where they were. You can click link to learn how retainers work.

Education and professional background

My passion in orthodontics has driven me to receiving many years of education and pursing professional development.  Being born and raised in Taiwan, I attended Taipei Medical University, where I earned my DDS and Master’s degree of Orthodontics in 1999 and 2003. I received my PhD degree from Baylor College of Dentistry, Dallas, Texas in 2008. Shortly before graduation, I was appointed as Assistant Professor of Orthodontics in the Indiana University School of Dentistry. Meanwhile, I completed my second Master’s degree in Dentistry and Orthodontic certificate from the Indiana University School of Dentistry.  Later in 2015, I was promoted to tenured Associated Professor and became a certified orthodontist by American Board of Orthodontists.

I love practicing, researching, and teaching orthodontics. There are more 40 scientific papers I published in American Journal of Orthodontics and Dentofacial Orthopedics, European Journal of Orthodontics, Angle orthodontists, and Bone.  I am also a coauthor of “Basic and Applied Bone Biology”.  In 2010, I was honored the Beni Solow Award because my article was selected the best paper of European Journal of Orthodontics. After serving as Director of Orthodontic Fellowship Program for 3 years, my enthusiasm of teaching was well recognized and honored the Outstanding Faculty Award in 2013.

Outside the office

  • Outside my professional life, I am also a loving husband and father of 2 boys. We love to travel and explore the outdoors. We enjoy clamming, camping, and hiking in state parks. My older son, Ryan, plays soccer all year round. You might run into us in the soccer fields of Washington Cup. My little boy, Jaylen, loves art. You might see us doing some craft projects together at school festival nights.

Professional Honor and Awards

Resident’s Choice- Outstanding Orthodontic Faculty Award

Indiana University School of Dentistry 2013


Beni Solow Award

European Orthodontic Society 2011


Albert P. Westfall Memorial Teaching Fellowship Award

American Association of Orthodontists 2010


Orthodontic Faculty Development Award American

Association of Orthodontists Foundation 2010


Faculty First Award

American Association of Orthodontists 2009


Outstanding Research Award

Congress of Taiwan Association of Orthodontics 2003


Best Graduate Resident

Taipei Medical University 2003

Dr. Terry R. Wallen, DDS, MS

Dr. Terry Wallen, the founder of our office, is one of the pioneer orthodontists in the northwest. He established our practice in 1974 and has treated more than ten thousand patients.

Academics and Accomplishments

  • Terry Wallen completed undergraduate studies at Seattle University.
  • He received his dental education at the University of Washington.
  • He received numerous awards for academic and clinical excellence.
  • Dr. Wallen was inducted into the Omicron Kappa Upsilon honor fraternity which is reserved for those graduating in the top 10% of each class.
  • At the University of Kentucky, he received his specialty training in orthodontics.


  • Wallen was a part-time Clinical Professor of Orthodontics at the University of Washington
  • A certified member of the American Board of Orthodontists.
  • A recipient of the Edward Hatton Award from the International Association of Dental Research
  • An Internationally-known lecturer and widely published author in the specialty of orthodontics
  • An editorial consultant to an orthodontic journal

118 SW 330th St #200, Federal Way, WA 98023

TEL:(253)838 - 0765

FAX:(253)838 - 3416

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