Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) oral-facial-digital syndrome ?
    ### Response:
    Oral-facial-digital syndrome is actually a group of related conditions that affect the development of the oral cavity (the mouth and teeth), facial features, and digits (fingers and toes).  Researchers have identified at least 13 potential forms of oral-facial-digital syndrome.
    