It is easy for us to tell fingernail biters at Delmarva Dental Services just by looking at their teeth. The lower four front teeth are usually uniformly worn along the edges but only the upper two front teeth show wear. The damage caused by this habit is twofold. Excessive bending of the tooth (yes teeth bend) causes microcracks in the enamel. These microcracks absorb stain, causing discolored teeth and over time the teeth wear and begin to chip. We have found throughout the years at Delmarva Dental Services, that fingernail and toothgrinding are the major reason for the need for cosmetic dentistry, especially porcelain veneers.