Teeth & Digestion (Cambridge (CIE) IGCSE Biology)

Types of Human Teeth

• Mechanical digestion is the breakdown of food into smaller pieces without chemical change to the food molecules

• It is mainly carried out by the chewing action of the teeth, the churning action of the stomach and the emulsification of fats by bile in the duodenum

• Teeth are held firmly in the bone of the jaw

  • They are used for chewing to increase the surface area of the food so that it can be exposed to saliva and other digestive juices and broken down more quickly

• The differing shapes and sizes of teeth enable them to perform slightly different functions:

  • Incisors - chisel-shaped for biting and cutting

  • Canines - pointed for tearing, holding and biting

  • Premolars and molars - larger, flat surfaces with ridges at the edges for chewing and grinding up food

Types of teeth

Structure of a Tooth

Structure of a typical tooth