It works
I have tried using a toothbrush, but that proved impossible.  My dogs would let me stick my finger in their mouth and rub their teeth and gums with a little bit of chicken flavored toothpaste, but that lacked the abrasive action needed to really accomplish brushing. The finger brush was the perfect solution.  I have small dogs, so I was a bit afraid the brush might be too big to get into their mouths, but it is not. The trick is to make them hold their mouth open with fingers of my left hand, while I brush with the finger of my right hand.  It is a learning experience for both of us, but the finger brush works.
Rating: 5 stars