Our Mission

We strive to provide you quality care in a relaxed, comfortable family-friendly setting. Our experienced staff partners with you to provide a beautiful healthy smile. We take the time to listen and thoroughly explain treatment options while utilizing computer technology to help you make more informed decisions regarding your oral health. Our goal is to establish a rewarding long term relationship for your life-long smile.

Our Staff

Dr. Porterfield

Dr. Porterfield began her career in dentistry in 1980 as a dental assistant, office manager, and a new mother. Raising two children with her husband, she returned to school to receive her doctorate from Southern Illinois University Edwardsville-School of Dental Medicine. She acquired her Granite City practice in January 2000. Her two children are now married with her daughter living locally, and her son living in Okinawa Japan with his wife and two children. When she is not at the office, she spends her time with her husband, Rick, a Scott Air Force Base retiree, her two dogs and cat. She also enjoys spending time with family and friends. Donna is active in her church and enjoys meditating and practicing Reiki outside of dentistry.

Lyndsie Thurnau RDH

Lyndsie Thurnau graduated from dental hygiene school in 2013. Prior to assuming the responsibilities of hygienist, she was employed by Dr. Porterfield part-time as a dental assistant and office manager. She is happily married to Stefan, a former United States Marine from St. Jacob, Illinois, who is currently employed as a land surveyor. Lyndsie and her husband have one son. She enjoys cooking, running and traveling. She is actively involved in her church and serves on the board of the PTO for their son's school.

Tami Hartwick

Tami Hartwick is the first friendly face you will usually see. As our office manager she helps find a convenient time for your appointment and will help you with your insurance and account. She began her career in 1992, working as a dental lab technician and dental assistant. She came to work for Dr. Porterfield in 2000, after previously working with her in another dental office. Tami is very knowledgeable and an excellent source for your answers. Tami and her husband Tim have 2 boys, They love doing wood work together, outdoor activities and spending time with family and friends. They have two dogs and a cat.