Sheppard, Dr. Mark, DDS Share: Medical and Dental Sheppard, Dr. Mark, DDS Visit Website 77 Southway Ave, Suite A Lewiston, ID 83501 (208) 743-2792 (208) 743-0534 (fax) Hours: Monday - Thursday 8:00am - 4:30pm, Friday by appointment About About Family Dentistry. Quality dental health care. Accepting new patients.