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THE DIGESTIVE SYSTEM
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STATION 8: Digestion starts in the mouth
Teeth masticate (chew) food into smaller pieces;
humans have two sets of teeth:
! Deciduous (baby or milk) teeth
• 20 teeth are fully formed by age 2
• Incisors come in first (6-8 months)
! Permanent teeth
• Replace deciduous teeth between the ages of 6
to 12 (molars during teens and early twenties)
• A full set is 32 teeth, but some people do not have
wisdom teeth
STATION 8: Digestion starts in the mouth
Classification of Teeth
• Incisors – are chisel-shaped for cutting or
shearing food into small chewable pieces
• Canine – (cuspids) have a sharp, pointed biting
surface to pierce and tear food
• Premolars – (bicuspids) have a flat biting
surface used for crushing
• Molars – the largest of the teeth; they have a
large flat biting surface used for grinding
STATION 8: Digestion starts in the mouth
Tooth Anatomy
• Cement – layer of connective tissue that binds the
roots of the teeth firmly to the gums and jawbone
• Dentin – bonelike; forms most of the tooth
• Enamel – hardest substance in the body; outermost
layer of a tooth, covers the crown
• Gingiva – surrounds teeth, recedes with age
• Pulp Cavity – living part of the tooth; contains blood
vessels & nerves
• Root Canal – provides a route for blood vessels
and nerves to reach pulp

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Station 8 digestive system

  • 2. STATION 8: Digestion starts in the mouth Teeth masticate (chew) food into smaller pieces; humans have two sets of teeth: ! Deciduous (baby or milk) teeth • 20 teeth are fully formed by age 2 • Incisors come in first (6-8 months) ! Permanent teeth • Replace deciduous teeth between the ages of 6 to 12 (molars during teens and early twenties) • A full set is 32 teeth, but some people do not have wisdom teeth
  • 3. STATION 8: Digestion starts in the mouth Classification of Teeth • Incisors – are chisel-shaped for cutting or shearing food into small chewable pieces • Canine – (cuspids) have a sharp, pointed biting surface to pierce and tear food • Premolars – (bicuspids) have a flat biting surface used for crushing • Molars – the largest of the teeth; they have a large flat biting surface used for grinding
  • 4. STATION 8: Digestion starts in the mouth Tooth Anatomy • Cement – layer of connective tissue that binds the roots of the teeth firmly to the gums and jawbone • Dentin – bonelike; forms most of the tooth • Enamel – hardest substance in the body; outermost layer of a tooth, covers the crown • Gingiva – surrounds teeth, recedes with age • Pulp Cavity – living part of the tooth; contains blood vessels & nerves • Root Canal – provides a route for blood vessels and nerves to reach pulp