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Quick Answer. According to WebMD, a typical adult dog has 42 teeth, including incisors, canines, premolars and molars. Each jaw has six incisors in the front, one canine at each end of the incisors and eight premolars. The back of the top jaw has four molars, while the bottom jaw has six.
While there are some variances between breeds, teething generally lasts two to three months, but can last up to five months. Teething Process. As a puppy, a dog has 28 teeth. During the teething phase, those 28 teeth fall out and are replaced with 42 teeth (give or take a few teeth for a some breeds). The teething process usually begins around four months of age and completes at about seven months of age. Incisors.