depend on us for life
brighter smiles
happier people
happier people
The Orthodontic Team You Can Count On.
meet dr. sierk
Hi, my name is Dr. Sierk, but feel free to call me Chris. I grew up in a dental family in Bettendorf, Iowa, and spent summers working in my father Don’s orthodontic practice. Both of my brothers are also dentists, Jon is a pediatric dentist in Highlands Ranch, Colorado, and Alex took over my dad’s orthodontic practice in Iowa. I have practiced since 2000 between Tigard and West Linn, and since 2013 on the Southern Oregon Coast. My wife Polly is a teacher but her passion is her large circle of friends, traveling, and spending time on her boat, the Sundollar. We raised our kids in West Linn, and our son Jack is a CPA in Atlanta, Georgia, and our daughter Elsa is a RN in Virginia. I truly couldn’t have dreamed of a more enjoyable profession, and I consider it an honor to come into the office each day. As an orthodontist my job has never felt like work, each day is unique and fun. Outside of the office I enjoy traveling to see family, playing golf, and cheering on the Saint Louis Cardinals, Minnesota Vikings, and the Iowa Hawkeyes.
We Take Care of You
our team
-
HollyI’m a lifelong Oregonian. I’ve been an orthodontic assistant for 13 years. I met my husband in middle school and we have a 4 year old son, 1 year old daughter, and two dogs. When I’m not working I love to spend time with my family. I love traveling, the sunshine, and I’m an avid reader. I enjoy ortho because it’s the most fun specialty and it’s so rewarding to see how each patients smile changes and the happiness it can bring them.
-
KatieHello, I am Katie the Scheduling Coordinator and one of the friendly faces you’ll see in the front office! I earned my dental assisting degree from Blue Mountain Community College and I’m excited to be back in the dental field. I have recently returned to the dental field after taking a break to focus on raising my family.Outside of the office, I enjoy spending time with my husband of 23 years, our two children, and our energetic dog—Charlee a GSP. I especially love watching my kids play sports and cheering from the baseball stands. Go West Linn!
-
ChristinaHello, my name is Christina. I work with several dental practices as a consultant, bookkeeper and business manager, overseeing, vendor, insurance and patient accounts while supporting the growth and success of each office. In January 2026, I was given the opportunity to begin working with Dr. Sierk and his amazing team, where I continue to bring my experience and passion for the dental field.With more than 30 years of experience in dentistry, my career began in Honolulu, Hawaii, as a surgical dental assistant. Over the years, I have enjoyed learning all aspects of the dental field, which has allowed me to assist multiple practices in reaching their fullest potential.Outside of my professional life, I am the proud mother of a wonderful daughter who recently earned her associate degree and is now pursuing her dream of becoming a commercial and private pilot through aviation school.
-
Andrea
Hello, I’m Andrea! I coordinate the back office as a chairside assistant and also handle supply ordering. Basically, I make sure our clinic is running smoothly. I have 17 years of orthodontic assisting experience, and even tried to apply to work at Sierk Orthodontics as a new grad in 2007 when our West Linn office just opened, but they were closed that day! Outside of work I enjoy music, road trips, and spending time with my cats and my English Bulldog Mr. Squish.
-
KloieHello, my name is Kloie and I am the Office Manager + Treatment Coordinator here at Sierk Orthodontics. I have been working in orthodontics since 2019.My passion is informing parents and patients on this amazing investment that they are making for the health of their teeth. I understand this can be a process that starts with a lot of questions, so please let me help you! My goal is to give my patients and families the best stress free orthodontic experience they can have.Outside of work, you can find me playing with my 4 dogs or out in my garden reading a book.
Our West Linn Office
Exceptional Care
Opened in March of 2007, Sierk Orthodontics and team have a stunning location to serve the families of West Linn and Oregon City. Located in the West Linn Central Village, our newest office is just two blocks north of I-205, at the Highway 43/Willamette Drive exit. Our West Linn practice makes it easy to incorporate state-of-the-art facilities and equipment with our continued focus on exceptional patient care.
Our Tigard Office
Serving Tigard for Two Generations
The Tigard practice has been in constant operation in its current location since 1978. Dr. Sierk took the reins in June of 2000, upon retirement of Dr. Richard Sutter. We moved into our new location on January 9, 2014. We are located at 12000 SW Main Street on the corner of 99W and Main Street. Our Tigard practice has served Tigard and the surrounding areas for two generations, and is intimately involved in supporting the local community.