Learn More About Our Practice

Dr. Shiotsu and Dr. Tam would like to personally invite you to explore what makes our practice unique and special.

About us.

Located on Mercer Island, WA our office provides general dentistry and total care to the eastside community! One unique part of our clinic is that Dr. Shiotsu and Dr. Tam are both certified clinicians in using dental microscopes to perform restorative dentistry. We believe in building patient relationships based on mutual trust, respect and excellent customer service.

Our office focuses on patient education and we encourage you to ask questions so that you can make informed decisions about your oral health condition. In doing so we hope that each patient has an active role in their care while in our office.

Meet the Doctors

Dr. Goichi Shiotsu

After graduating cum laude from the University of California, Irvine. Dr. Shiotsu earned his dental degree from the University of California at San Francisco, the #2 ranked dental school in the nation. While there, he was awarded the Regents' Scholarship for high academic achievement.

Following dental school, Dr. Shiotsu stayed in San Francisco where he completed a two-year postgraduate program in Advanced Education in General Dentistry, maintaining a special emphasis in Hospital Dentistry, Geriatric Dentistry, and Clinical Teaching. While receiving his advanced training in General Dentistry, Dr. Shiotsu found his passion in helping patients with complex dental issues often requiring dental implants, so he decided to pursue a specialty in prosthodontics. Upon completion of this training, Dr. Shiotsu moved to Southern California, where he completed two separate postgraduate programs in Prosthodontics and Implant Dentistry at Loma Linda University.

Dr. Shiotsu is highly respected by his colleagues, who often refer their patients to him for help in resolving complex and challenging dental situations. He is one of a handful of dentists in the U.S. to receive certified university-based specialty training in both the surgical and restorative aspect of implant dentistry. He is a national lecturer and an author, often asked to speak on the topic of implants and esthetic dentistry.

He is a member and the past president of the Washington State Society of Prosthodontists, and a member of the exclusive, prestigious Academy of Osseointegration. He is also a member of Washington State Dental Association where he was elected and served as member of house of delegates for two years (2013-2014). Dr. Shiotsu has been voted one of the area's Top Dentists by Seattle Metropolitan Magazine every year from 2011-2020.

Dr. Shiotsu believes that education is a lifelong endeavor. He is passionate about dentistry because he has seen so many lives transformed with enhanced function and confidence.

He has been an active member of the Mercer Island Rotary Club since 2011 where he serves on the Youth Exchange Committee. He also serves on the Mercer Island School District's Superintendent's Advisory Council.

Dr. Shiotsu enjoys playing tennis, yoga and spending time outdoors with his family.

Meet the Doctors

Dr. Ryan Tam

A native of Washington state, specifically Mercer Island, Dr. Tam graduated from Mercer Island High School in 2011 and then completed a Bachelor's of Science degree in Neurobiology at the University of Washington (UW). His strong interest in both art and science led him to the UW School of Dentistry, which he graduated with a Doctorate in Dental Surgery (DDS) in 2020.

Dr. Tam started his career as a volunteer dental assistant at the Dental Fears Research Clinic while at the UW. From there, Dr. Tam got involved with research on topical fluoride use and its effectiveness in preventing cavities.

During his undergraduate studies, Dr. Tam also worked both as a chemistry tutor and science educator at the Pacific Science Center. He strongly believes in the importance of science education and understanding how our oral health and teeth impacts our overall well-being.

Throughout dental school, Dr. Tam volunteered after school and on weekends, delivering care to underserved populations at the Union Gospel Mission in Seattle and in Longview, WA.

Dr. Tam consistently takes continuing education courses to master skills in delivering patient care. Most recently, Dr. Tam has learned to utilize the microscope for restorative dentistry and how to safely and effectively use oral conscious sedation for patients with high dental anxiety. He strongly believes that good oral health is the prerequisite for a long and healthy life.

He also knows how most people experience anxiety over dental visits out of fear of pain, unpleasant experiences, and many other factors. He acknowledges such anxieties by listening to patients' concerns and does his best to accommodate them by soft-touch treatments and providing them with thorough information. Dr. Tam believes in listening to patients' needs and desires, while educating them on their oral conditions based on the most up-to-date protocols and guidelines set by the ADA.

Meet Our Team

Linda Konishi

(Dental Hygienist)

Lori Matsumura

(Dental Hygienist)

Atsumi Takagi

(Lead Dental Assistant)

Madison Young

(Dental Assistant)

Tim Wong

(Dental Assistant)

Esther Cho

(Dental Assistant)

Jennifer Hansen

(Dental Assistant)

Tomoko Shiotsu

(Front Office)

Kelsey Fukuda

(Front Office)

Ji Martin

(Front Office)

Our patients say.

"I do appreciate the high level of training, expertise, and care that I consistently receive from Dr. Shiotsu and his entire staff."


“I would like to share how professional, courteous and helpful the entire Staff are at Dr. Shiotsu’s Office. They get the job done efficiently, safely and smoothly. Thank You Each and Everyone, for making my trip to the Dentists Office comfortable and caring. I truly felt that my 😁 was in Great Hands!”


“Outstanding, experienced, skilled dentist! Thorough and efficient. Referred to him by my previous dentist who was moving out-of-state and told me this is the dentist he would personally use for his oral care. I’ve been very pleased with the work he has performed. Office staff is welcoming and friendly, as well.”


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