There is recorded in Germany an account of a woman of ninety who had dentition at forty-seven and sixty-seven, each time a new set of teeth appearing; Hunter and Petrequin have observed similar cases.

Carter describes an example of third dentition.

Lison makes a curious observation of a sixth dentition.
Edentulousness .-- We have already noticed the association of congenital alopecia with edentulousness, but, strange to say, Magitot has remarked that "l'homme-chien," was the subject of defective dentition.

Borellus found atrophy of all the dental follicles in a woman of sixty who never had possessed any teeth.

Fanton-Touvet saw a boy of nine who had never had teeth, and Fox a woman who had but four in both jaws; Tomes cites several similar instances.