Serving St. John’s and the

Greater Portland Area Since 1974

Mellum family dentistry was started by Dr. Mike Mellum in 1974.  Mike grew up in Eugene, Oregon attending South Eugene High School, followed by the University of Oregon.  Mike graduated from University of Oregon Dental School (now OHSU) in 1972 and enlisted in the Army.  He was stationed at Fort Benning in Columbus, Georgia for 2 years and returned home to Oregon.  He settled in Portland and bought an existing practice in St. Johns. This practice has existed in the same location since 1974.


Dr. Nick Mellum grew up in Hillsboro, Oregon attending Glencoe High School followed by the University of Oregon. In 2006 he graduated from Tufts University School of Dental Medicine in Boston, Massachusetts. Nick returned home to Oregon to begin working with his father at the practice in St. Johns.

We have moved to 5610 N. Lombard

as of April 7, 2017

After 5 years of working together, Dr. Mike Mellum decided to retire and sell the practice to Nick. Since the beginning of 2012 the practice has been run by Dr. Nick Mellum. The practice has maintained the standards begun by Dr. Mike, but has also upgraded equipment over time to stay up to date.  These upgrades include switching to digital x-rays and charts in 2013. We use reciprocating files in an electric motor for our root canals, a type of equipment that is used by specialists in the endodontic field.


In 2016 we began using Silver Diamine Fluoride to interrupt the cavity forming process for some patients.  Silver Fluoride, or SDF, is a clear solution that is painted on to sensitive root surfaces or carious lesions. The silver solution penetrates into the lesion and the silver helps kill the cavity forming bacteria by breaking down bacterial cell walls. The silver then hardens into the dentin layer of the tooth and keeps the cavity formation process from continuing. This treatment is especially useful for an interim treatment of cavities in young children that cannot maintain still to treat the cavity by placing a filling. After the child is older and understands what we are trying to accomplish, we can go back and place a filling in the tooth. This is a great treatment for keeping children from needing to go to the operating room to be put under general anesthesia to have their cavities filled. This treatment has recently been brought up on Good Morning America and in the New York Times.

Mellum Family Dentistry

Nicholas R. Mellum - D.M.D., P.C

503-283-2553 |
5610 N. Lombard St., Portland, OR 97203

503-283-2553 |
5610 N. Lombard St., Portland, OR 97203