<prompt> Talon cusp can be seen in:Mohr syndromeRubinstein Taybi syndromeSturge - Weber syndromeAll of the above  <response>: Talon cusp is an additional cusp that is usually located on the lingual surface of anterior teeth. It extends atleast half the distance from the cemento-enamel junction to the incisal edge. It is composed of normal enamel and dentin and contains a horn of pulp tissue.It is seen in: Mohr syndromeRubinstein Taybi syndromeSturge-Weber syndrome 