有關牙齒的認識
牙齒的構造、特徵及相應功能。 Structure Characteristics Related function(s) Enamel Non-living, made mainly of calcium salts Protect the tooth from wearing Dentine Contain living tissue Replace the enamel Pulp cavity Contain nerve fibre Contain blood vessels Detect temperature and pressure Supply oxygen and nutrients to the tooth 不同種類牙齒的特徵及相關功能。 Type Features functions Incisor Chisel-shaped / with flat sharp edge Biting and cutting food Canine Pointed and curved Tearing flesh (with the help of muscles) Premolar Broad top with cusps Crushing and grinding food molar Broad top with cusps Crushing and grinding food