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Oral Care Guide For Teens - Knowing Your Teeth - Tooth structure

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Photograph of a longitudinal section of a tooth and its surrounding tissue, showing the hard tissues, soft tissues and periodontal tissues.

In our life time, we have two sets of teeth: deciduous teeth and permanent teeth. There are 20 deciduous teeth, and 32 permanent teeth. Dentine is slightly yellowish in colour. Since enamel in permanent teeth is more transparent than that of deciduous teeth, the colour of dentine shows through more easily in permanent teeth. Therefore, permanent teeth are usually more yellowish when compared to deciduous teeth. Since dentine thickens as we get older, our teeth may become more yellowish with age.

Tooth components
Hard tissues
Enamel
  • The outermost layer of the crown
  • Mainly consists of minerals
    (Calcium, Phosphorus, etc.)
  • The hardest tissue of human body
  • Generally transparent or milky white in colour
Dentine
  • The second layer of the crown of tooth
  • Generally light yellow in colour which
    determines the overall colour of the tooth
  • There are many microscopic tubules inside the dentine which connect to the pulp
Cementum
  • A hard tissue covering the root surface of a tooth
  • Connecting the periodontal membrane and dentine of the root of tooth

 
Soft tissues
 
Pulp
  • The chamber inside a tooth
  • Filled with blood vessels and nerve fibres
 

Periodontal tissues
(tissues surrounding the tooth)
Gingivae
  • Also known as "gums"
  • A layer of soft tissue covering the surface of alveolar bone
  • Healthy gingivae are pink in colour
Periodontal membrane
  • A layer of fibrous tissue
  • Connecting cementum and alveolar bone
  • A buffer of teeth to sustain pressure from chewing to avoid teeth damages
Alveolar bone
  • Bony tissue surrounding a tooth for its support
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