Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Amelogenesis imperfecta ?
    ### Response:
    Amelogenesis imperfecta (AI) (amelogenesis - enamel formation; imperfecta - imperfect) is a disorder that affects the structure and appearance of the enamel of the teeth. This condition causes teeth to be unusually small, discolored, pitted or grooved, and prone to rapid wear and breakage.
    