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According to : Is Your Puppy Teething? Understanding and Handling Chewing Behavior

Puppies are born without teeth but baby canines (the longer teeth on each side in the front of the mouth) begin erupting at around 3 to 4 weeks of age, with incisors (the tiny teeth in the front) and premolars (larger side teeth) coming in at around 4 to 6 weeks of age. Puppies should have a total of 28 baby teeth by the age of 8 weeks.

Around the age of 4 to 5 months, puppies will begin shedding their baby teeth and by the age of 7 months all permanent incisors, canines, premolars and molars should be in. Adult dogs of most breeds have 42 teeth.