. Human physiology. Fig. 85. — Showing thefour kinds of HumanTeeth. x, incisor tooth (exterior view) ;2, canine tooth (exteriorview) ; 3, bicuspid tooth (sideview showing the two cusps);4, molar tooth (exterior view). Fig. 86.—Section of the Jaws of a Child of 61Years, showing the Milk or Deciduous Teeth,also the Permanent Teeth in Process ofFormation. di, the milk incisors ; dc, the milk canines ; <£}, and di,, themilk molars; zi and iz, the permanent incisors; £,thepermanent canines ; ^3 and /.), the permanent bicuspids;mi, the first permanent molars, which have already madetheir appearan
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. Human physiology. Fig. 85. — Showing thefour kinds of HumanTeeth. x, incisor tooth (exterior view) ;2, canine tooth (exteriorview) ; 3, bicuspid tooth (sideview showing the two cusps);4, molar tooth (exterior view). Fig. 86.—Section of the Jaws of a Child of 61Years, showing the Milk or Deciduous Teeth, also the Permanent Teeth in Process ofFormation. di, the milk incisors ; dc, the milk canines ; <£}, and di, , themilk molars; zi and iz, the permanent incisors; £, thepermanent canines ; ^3 and /.), the permanent bicuspids;mi, the first permanent molars, which have already madetheir appearance ; mi and WZ3, the second and thirdpermanent molars. six molars. The last of the molars are called the wisdom teeth; theydo not appear till between the seventeenth and twenty-fifth years.The mass of a tooth consists chiefly of a hard substance calleddentine or ivory (Lat. dens, a tooth). It resembles in compositionthe compact tissue of bone, but contains a much larger proportionof mineral matter (seventy-two