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Topsham Dental Arts
Excellence by Choice
Call: (207) 798-6700

Meet the Doctors

Excellence in dentistry begins with a careful co-diagnosis and treatment plan to establish the goals we will achieve together. Communication and long-term relationships are important to us. Let us know what is on your mind and ask questions. We will help you realize an investment in yourself pays dividends for a lifetime.  We are caring, skilled professionals, dedicated to simplifying what is often a very complicated and confusing area of health care. We want all our patients to be informed and knowledgeable about their dental health care, from treatment plans and services, to insurance coverage.

Dr. Howard Sprague

J.Howard Sprague, DDS attended Atlantic Union College and graduated from Loma Linda University School of Dentistry in 1962 as one of the top clinicians in his class. Following graduation he practiced for two years as an officer in the US Public Health Service attached to the Ninth District Coast Guard. Twenty-four years of private practice in Claremont, NH followed. During this time Dr. Sprague served as president of the Grafton-Sullivan County Dental Society, president of the Sullivan County unit of the American Cancer Society and on the NH Division Board of the American Cancer Society. In 1987 Dr. Sprague and his family moved to South Lancaster, MA for twenty years of enjoyable practice.  Dr. Sprague and his family are pleased to now be located here in Maine where so much time was previously spent driving to! Dr. Sprague's special interests include dental implant placement, oral surgery and periodontics. 

Mission service has been a highlight of Dr. Sprague's career.  He and Rosemary, his wife, have spent several months each in Kenya and St. Kitts, where they provided dental care at the Seventh Day Adventist mission clinics.

Outside the office, he enjoys playing the violin and viola, flying model aircraft, camping, hiking and astronomy.


Dr. Polly S Nichols

Polly S. Nichols, DDS, MA is a 1996 graduate of Loma Linda University School of Dentistry. Mission service was an integral part of her LLUSD experience and included providing dentistry in Malawi, Brazil, Fiji, Thailand and Mexico. During her senior year at LLUSD she was named Student of the Year and was recognized by the American Association of Women Dentists. 

After earning her DDS, Dr. Nichols served as a clinical instructor for the restorative department at LLUSD, as well as working for the pediatric and oral surgery departments. During this time she completed her MA in Biomedical and Clinical Ethics from the Loma Linda University Graduate School. Dr. Nichols co-authored the ethics column in the Journal of the Academy of General Dentistry for five years. 

Dr. Nichols' special areas of interest include esthetic restorative procedures and implants, including advanced training in mini implants for denture stabilization.  Outside the office Dr. Nichols enjoys reading, cooking and making music with the rest of the family (she plays violin, piano and organ).

Dr. Nichols graduated in 1992 from Atlantic Union College with a BA in biology, magna cum laude. She is married to Timothy Nichols, MBA and they have four children, Summer Rose, Timothy Ethan, Katie Grace and Emily Lorena.


Dr. Per Houmann

Dr. Houmann is coming to us from Hagerstown, Maryland where he has been in active practice for the past 14 years.  He is a graduate of Loma Linda University School of Dentistry in Loma Linda, California. 

During his professional career he and his family served six years in Rwanda and Malawi. Short term dental missions have included Ethiopia, Russia and Argentina.  He has also been actively involved in helping the underprivileged through Convoy of Hope and prison ministry.

Dr. Houmann enjoys working with people and doing intricate work with his hands.  His focus is to teach, restore health, and build trust through gentleness, integrity and respect.  His philosophy of life centers on the golden rule: treating his patients as he would want to be treated. 

His favorite activities include hiking, gardening, photography, birding, music and family.


Dr. Gregory Sprague

After serving his patients at Topsham Dental Arts for seven years, in 2015 Dr. Gregory H. Sprague returned to Loma Linda University School of Dentistry to expand his education and specialize in Endodontics. His patients remain in the capable care of Dr. Howard Sprague, Dr. Polly Nichols and Dr. Per Houmann.