I brush Mimi & Momo's teeth every other night. We use Four Paws Pet Dental...it smells like vanilla. They seem to like the flavor, even tho they hate to have their teeth brushed...they'll lick the toothpaste. So as long as there's tpaste to lick...they'll tolerate me brushing them. I guess the trick is to pick a tpaste that they'll like.
I use the finger brush to brush their front teeth & the smaller end of the double ended toothbrush to clean their back teeth.