In an Ethiopian Soemmering has seen one molar too many on each side and in each jaw.

Ploucquet and Tesmer have seen five incisors and Fanchard six.

Many persons have the supernumerary teeth parallel with their neighbors, anteriorly or posteriorly.

Costa reports a case in which there were five canine teeth in the upper jaw, two placed laterally on either side, and one on the right side behind the other two.

The patient was twenty-six years of age, well formed and in good health.
In some cases there is fusion of the teeth.