Britannica Sources used in this answer

How many primary teeth do humans have?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

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.

Humans have 20 primary teeth, which are also known as deciduous or milk teeth. This set of teeth is acquired gradually between the ages of six months and two and a half years. The primary dentition consists of four incisors, two canines, and four molars in each jaw. These teeth are eventually shed and replaced by a permanent set of 32 teeth.12