You are correct ZoesMom a dog can be taught. When a client tells me their dog will not let them brush, they always say they are using the brush. When I suggest the finger cuff they have no problems.
Petroyalty no matter what brush type you use be sure the teeth are clean/tartar free. It is worthless to brush tartar. I do not brush my own dogs teeth. I do however give them plenty of things to chew on which does help with tartar. If they happen to get a little tartar build up I scale it off.