Types of Teeth Incisors — the sharp, chisel-shaped front teeth (four upper, four lower) used for cutting food. Canines — sometimes called cuspids, these teeth are shaped like points (cusps) and are used for tearing food. Premolars — these teeth have two pointed cusps on their biting surface and are sometimes referred to as bicuspids. The premolars are for crushing and tearing. Molars — used for grinding, these teeth have several cusps on the biting surface

Teeth Slide 14.35a Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  The role is to masticate (chew) food  Humans have two sets of teeth  Deciduous (baby or milk) teeth  20 teeth are fully formed by age two

Teeth Slide 14.35b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Permanent teeth  Replace deciduous teeth beginning between the ages of 6 to 12  A full set is 32 teeth, but some people do not have wisdom teeth

Classification of Teeth Slide 14.36b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Figure 14.9

Regions of a Tooth Slide 14.37a Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Crown – exposed part  Outer enamel  Dentin  Pulp cavity  Neck  Region in contact with the gum  Connects crown to root Figure 14.10

Regions of a Tooth Slide 14.37b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Root  Periodontal membrane attached to the bone  Root canal carrying blood vessels and nerves Figure 14.10

Tongue Attached at hyoid bone and styloid processes of skull Lingual frenulum secures tongue to the floor of the mouth Taste Buds-receptors for sense of taste Papillae- small peglike projections on surface of tongue