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How does the number of roots differ among incisors canines premolars and molars?

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A labeled cross section illustration of an adult human molar shows the tooth's crown and root, with layers including enamel, dentin, and pulp, as well as gum, cementum, blood vessels, periodontal ligament, lateral canals, and nerve. — tooth Cross section of an adult human molar.

In human anatomy, the number of roots varies depending on the type of tooth:

Incisors, Canines, and Premolars: These teeth typically have a single root.1
Molars: These teeth generally have two or three roots.1

While these are the standard configurations, it is important to note that the number of roots can vary, particularly in the case of the human third molar, which tends to be variable in its root count, size, and cusp pattern.1