Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
A tooth is a calcified structure in the mouth used for biting and chewing food. It plays a critical role in the initial stage of digestion and maintaining oral health.
5 Must Know Facts For Your Next Test
Teeth are covered by enamel, the hardest substance in the human body, which protects against microbial attack.
The pulp inside each tooth contains nerves and blood vessels that can be affected by infections.
Plaque, a biofilm of bacteria, can form on teeth surfaces and lead to cavities and gum disease if not removed.
Streptococcus mutans is a primary bacterium associated with dental caries (tooth decay).
Periodontal disease, an infection of the structures around the teeth, is primarily caused by anaerobic bacteria.
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Related terms
Enamel: The hard outer surface layer of a tooth that provides protection.
Pulp: The innermost part of a tooth containing nerves and blood vessels.
Plaque: A sticky film of bacteria that forms on teeth surfaces and can lead to cavities and gum disease.