Amelogenesis imperfecta is a genetic disorder that affects the development of enamel in teeth, causing them to appear abnormally small, discolored, pitted or grooved. It is caused by mutations in genes responsible for enamel protein production. Symptoms include soft, thin enamel that leads to highly sensitive teeth that are prone to cavities, damage, and early loss. Treatment may involve crowns, extractions, and dental implants or dentures in severe cases.