My three stinkpots get a bath once a week. If I'm particularly busy or lazy, it's less but we never go more than 10 days or so.
As for tooth brushing - all three of mine brush their teeth. Barney and Daisy need help, but Teddy does his own.
Here is a link to Teddy brushing his teeth with the electric toothbrush (the flick that made him famous and the apple of Bella Boo's eye).
http://www.yorkietalk.com/forums/my-...oothbrush.html