Teeths

Teeths are hard, calcified structures anchored in the jaws of many vertebrates. The normal plural is teeth; the form "teeths" is not standard English and is generally avoided in formal writing. In humans, teeth perform cutting, tearing, and grinding to process food, contributing to digestion and supporting speech and facial expression.

Anatomy: Teeth have a crown and roots, and are composed of enamel, dentin, pulp, and cementum. Enamel is the hard, outer layer; dentin lies beneath; the pulp contains nerves and blood vessels. The crown is visible above the gum line, while the roots sit in alveolar sockets and are anchored by the periodontal ligament.

Classification and dentition: Adults typically have 32 permanent teeth—incisors, canines, premolars, and molars. Children develop 20 deciduous (primary) teeth that are gradually shed and replaced. Third molars, or wisdom teeth, may erupt late or be absent.

Development and care: Teeth begin forming before birth; eruption occurs in early childhood. Good oral hygiene, regular brushing with fluoride toothpaste, flossing, limiting sugary foods, and routine dental visits help prevent cavities and gum disease.

Health relevance: Dental caries and periodontal disease are widespread, with other issues including trauma and malocclusion. Teeth are studied in odontology and anthropology to understand health, diet, and evolution.