LA GRANDE DENTIST: MARK HARRIS, DMD Dr. Harris is La Grande’s Premier Choice for Family & Cosmetic Dentistry At the practice of Dr. Mark Harris, we combine traditional service values with forward-thinking dental treatments. Our La Grande, Oregon dental office features the latest technology, including dental lasers, and Dr. Harris stays abreast of modern dental solutions. We proudly offer an array of family dentistry and cosmetic dentistry services designed for patients of all ages.