Most puppies will mouth or play bite almost through the age of 2 years old. My suggestion is to do crate training which is an excellent way to put them to rest when you're not home or at night and they learn to use that as a safe haven and they know how to calm down and chill out in the crate. Also, please provide plenty of Rawhide to chew on and toysthat they can chew on because they will chew everything if you allow them to