This difficulty may exist either alone or in connection with hare-lip, being also the result of defective development. The cleft may involve simply the uvula, or hanging part of the soft palate, or may extend through the whole roof of the mouth. A person suffering with an extensive cleft of the palate, has a peculiar nasal tone of voice and great indistinctness of articulation.

The treatment consists in closure of the cleft by a surgical operation. As a general rule, the operation is by no means so successful as in hare-lip. The art of dentistry presents a much more perfect remedy in an artificial hard palate to close the roof of the mouth, to which is attached, at the back end, an artificial soft palate composed of rubber.