Piper is 15 weeks old now and I've had him for about 2 1/2 weeks, when does he begin to lose his baby teeth? And what should I look for when trying to determine if he is losing them and things are going wrong? I know they are prone to plaque buildup so should I be brushing with one of those little finger things? I have no clue as to when and what I should be doing for him

Just don't want to screw him up. Thanks