Teeth are necessary for chewing food. Primary (baby) teeth are also vital in younger children in speech development, while maintaining the space necessary for the permanent teeth. As a person’s appearance depends on the presence of the teeth, maintaining a healthy smile is desirable.
- Between the ages of 6 months to 3 years children’s baby (deciduous) teeth erupt.
- There are 20 baby teeth.
- All of the baby teeth are normally replaced by permanent teeth between the ages of 6 – 13 years.
- Wisdom teeth erupt between the ages of 17 – 21 years but not everyone gets them.
- There are 32 permanent teeth.
Age that the teeth appear
1. Primary (baby, deciduous) teeth
|1st Incisor||6 – 10 months||8 – 12 months|
|2nd incisor||10 – 16 months||9 – 13 months|
|Canine||17 – 23 months||16 – 22 months|
|1st Molar||14 – 18 months||13 – 19 months|
|2nd Molar||23 – 31 months||25 – 33 months|
2. Secondary (adult, permanent) teeth
|1st Incisor||6 – 7 years||7 – 8 years|
|2nd Incisor||7 – 8 years||8 – 9 years|
|Canine||9 – 10 years||11 – 12 years|
|1st Premolar||10 – 11 years||10 – 12 years|
|2nd Premolar||11 – 12 years||10 – 12 years|
|1st Molar||6 – 7 yeas||6 – 7 years|
|2nd Molar||11 – 13 years||12 – 13 years|
|3rd Molar (Wisdom Tooth)||17 – 21 years||17 – 21 years|
Types of teeth and their functions
|Premolars (permanent)||Tearing and Chewing|
The Structure of the Teeth
The enamel is the whitish, outer shell that can be seen in the mouth. It is the hardest material in the body and is used to protect the layers below.
This is the yellow layer beneath the enamel. This layer is softer, a bit like bone. It contains some of the nerve fibres in the tooth.
The pulp contains the nerves and blood vessels that keep the tooth alive. The pulp can be damaged through decay or injury.
Teeth are separated from the jaw bone by the gums. They provide a shock absorber for the teeth.