Abfraction's the loss of tooth structure from flexural forces. This hasn't been supported yet by dental research but it's hypothesized that enamel, especially at the cementoenamel junction (CEJ), undergo this pattern of destruction by separating the enamel rods. As teeth flex under pressure, the arrangement of teeth touching each other, known as occlusion, causes tension on one side of the tooth and compression on the other side of the tooth. This's believed to cause V-shaped depressions on the… (More on Abfraction)