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By 9 days old, all the milk teeth have emerged, with a dental formula of 2.1.2.0 2.1.2.0 and a total of 20 teeth. By 140 days old (4.6 months), all the milk teeth have fallen and been replaced by permanent teeth. The canines are usually replaced first, followed by the premolars, incisors, and then molars. [17]