How old are dogs when they start to change their teeth

Puppies usually start to change their teeth when they are three months old and the cycle of tooth replacement usually lasts for some time, with all the teeth being replaced at around nine months. Dogs may be more inclined to chew on slippers or wooden furniture in the home during the teething period. Consider giving your dog treats such as dog chews and teething sticks to promote teeth grinding during the teething period.