Anatomy

Humans usually have 20 primary (deciduous, “baby” or “milk”) teeth and 32 permanent (adult) teeth. Teeth are classified as incisors, canines, premolars (also called bicuspids),[5] and molars. Incisors are primarily used for biting pieces from foods such as raw carrots or apples and peeled but uncut bananas, while molars are used primarily for grinding foods after they are already in bite size pieces inside the mouth.

Most teeth have identifiable features that distinguish them from others. There are several different notation systems to refer to a specific tooth. The three most common systems are the FDI World Dental Federation notation, the universal numbering system, and Palmer notation method. The FDI system is used worldwide, and the universal is used widely in the United States.

Primary teeth

Among deciduous (primary) teeth, ten are found in the maxilla (upper jaw) and ten in the mandible (lower jaw), for a total of 20.

In the primary set of teeth, there are two types of incisors – centrals and laterals, and two types of molars – first and second. All primary teeth are normally later replaced with their permanent counterparts.

Permanent teeth

Among permanent teeth, 16 are found in the maxilla and 16 in the mandible, for a total of 32.

The maxillary teeth are the maxillary central incisor, maxillary lateral incisor, maxillary canine, maxillary first premolar, maxillary second premolar, maxillary first molar, maxillary second molar, and maxillary third molar. The mandibular teeth are the mandibular central incisor, mandibular lateral incisor, mandibular canine, mandibular first premolar, mandibular second premolar, mandibular first molar, mandibular second molar, and mandibular third molar. Third molars are commonly called “wisdom teeth” and may never erupt into the mouth or form at all. If any additional teeth form, for example, fourth and fifth molars, which are rare, they are referred to as supernumerary teeth (hyperdontia). Development of fewer than the usual number of teeth is called hypodontia.

Learn More!

Getting to know your teeth is fun! Learn all about your teeth with our fun, interactive, and educational diagrams:

  • Anatomy of a Tooth
  • Know Your Teeth
  • Brushing & Flossing Instructions
  • Printable Brushing & Flossing instructions

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