So when we got Bubba and Bunny I decided to start them with early tooth brushing. I use a product just for pets called Maxi/Guard Oral Cleansing Gel, which I buy on Amazon. I apply a small amount of gel onto a 1" x 1" gauze pad and rub it across both their top and bottom teeth on each side of the mouth. Supposedly it is chicken flavored, and they don't love it, but they do tolerate it to get a treat afterwards.
This came from the PETA website. It wasn't signed so I don't know the author but I think it is well worth reading.
Tiny Paw Bracelet available at www.tropicalkaren.com