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1 ½ yr Cusps worn off lower I 1.
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2 ½ yr Cusps worn off lower I 2.
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3 ½ yr Cusps worn off upper I 1.
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4 ½ yr Cusps worn off upper I 2.
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5 yr Cusps of lower I 3 slightly worn. Occlusal surface
of lower I 1 and I 2 rectangular. Slight wear of canines.
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6 yr Cusps worn off lower I 3. Canines worn blunt. Lower
canine shows impression of upper I 3.
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7 yr Occlusal surface of lower I 1 elliptical with the
long axis sagittal.
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8 yr Occlusal surface of lower I 1 inclined forward.
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10 yr Lower I 2 and upper I 1 have elliptical occlusal
surfaces.
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12 yr Incisors begin to fall out (unless care has been
taken to maintain healthy gingival and periodontal tissues).
The dental formula for puppies is, 2(Di 3/3 Dc 1/1 Dp 3/3 = 28
The dental formula for adult dogs is, 2(I3/3 C 1/1 P 4/4 M 2/3) = 42

They just fell out, Types Of
Teeth,
Jaw, Keeping them clean,
Tooth Development
age of dog