1. The Teeth © PDST Home Economics

2. Healthy Teeth & Gums Help us to digest food Help us to digest food Make us look better Make us look better Good health – bad teeth cause bad breath, abscesses, stomach upset Good health – bad teeth cause bad breath, abscesses, stomach upset Help us speak clearly Help us speak clearly

3. Sets of Teeth Primary Teeth aka milk, temporary. Primary Teeth aka milk, temporary. 20 teeth 20 teeth 0 to 7 yrs 0 to 7 yrs Permanent Teeth Permanent Teeth 32 teeth 32 teeth 8yrs to death 8yrs to death

4. Types and functions of teeth TypesNumberFunction Incisor8 Cut & bite Canine4Tear Premolar8 Chew & grind Molar12

5. Structure of the Tooth

6. Structure 2 main part (a) crown, (b) root 2 main part (a) crown, (b) root Mostly made of dentine which is like bone Mostly made of dentine which is like bone The crown is covered in enamel, the hardest substance in the body. The crown is covered in enamel, the hardest substance in the body. The root is covered in cement which sticks the tooth in the gum and bone The root is covered in cement which sticks the tooth in the gum and bone In the centre of the dentine is a space called the pulp cavity, blood vessels and nerves are found here In the centre of the dentine is a space called the pulp cavity, blood vessels and nerves are found here

7. Dental Health 2 main dental health problems are (a) tooth decay and (b) gum disease. 2 main dental health problems are (a) tooth decay and (b) gum disease. Both are caused by plaque, a mixture of food saliva and bacteria that build up on the teeth. Both are caused by plaque, a mixture of food saliva and bacteria that build up on the teeth. Tooth decay: Bacteria react with food forming acid which burns into the tooth causing a cavity, when the decay reaches the nerve pain is felt. Tooth decay: Bacteria react with food forming acid which burns into the tooth causing a cavity, when the decay reaches the nerve pain is felt.

8. Gum disease

9. Dental decay

10. Care of teeth Brush twice a day at least using fluoride toothpaste Brush twice a day at least using fluoride toothpaste Floss at night to avoid gum disease Floss at night to avoid gum disease Replace toothbrush regularly Replace toothbrush regularly Visit dentist every 6 months Visit dentist every 6 months Avoid sugary foods Avoid sugary foods Eat calcium and Vit D rich foods Eat calcium and Vit D rich foods

11. Fluoride Mineral element that makes tooth enamel stronger and prevents decay. Mineral element that makes tooth enamel stronger and prevents decay. Added to our water supply, toothpaste and mouth wash Added to our water supply, toothpaste and mouth wash