A lil bit of plaque on teeth is important because it makes it so you don't take the enamel off of them, which is very important for your teeth to have so they don't rot.
All dogs can develop tartar on their teeth. You should make sure your dog is receiving a proper diet and try to clean their teeth around once a week with an enzyme toothpaste & toothbrush- they...
about 20 they start coming out at about 6 moths. they will all fall out bout when your 14 or 16, and replaced by permanent teeth. http://www.intelligentdental.com/2010/02/22/dental-care-for-babies/