How can I tell the age of my Yorkshire? Yorkshire’s age can be estimated by looking at his teeth. Under 2 months, he has only milk teeth, 2-4 months for incisors, 4-6 months for canines, and 6-10 months for molars. One month: all incisors, canines, first and second premolars emerge. Two months: Second premolars and redundant teeth (first third molars) emerge. Four months: The incisors and first premolars are exchanged and the first posterior molars emerge. Four and a half months: middle teeth, first, second and third premolars are exchanged. Five and six months: the corner teeth, canine teeth, second and third and fourth premolar-like teeth are exchanged, and the second and third posterior molars emerge. Seven months: all teeth are exchanged. 1 to 2 years: incisor tricuspid disappears. 2 to 3 years: mesiodistal tricuspid disappears. 4 to 5 years: corner tricuspid disappears. 5 to 6 years: incisor tricuspid enlarges. 6 to 7 years: mesiodistal tricuspid enlarges. 8 to 9 years: corner tricuspid enlarges.
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