How many teeth do a monkeys have?

There are over 100 species of monkeys.

The common chimpanzee has 32.
(8 teeth X 4 quadrants)

Each quadrant of their mouth have:
2 incisors - 1 canine - 2 premolars - 3 molars

All Old World monkeys, apes, and humans share this 2.1.2.3 dental formula.

New World Monkeys have an extra premolar, giving them a 2.1.3.3 formula. Marmosets and tamarins, the smallest of these monkeys do not have a third molar, giving them a 2.1.3.2 dental formula.