I never knew of anyone brushing their dogs' teeth until just the last few years, and I've never tried to do it myself. However, today happens to be our Chihuahua's birthday; she's 9 years old today. But on June 12, 2013, I let the vet clean her teeth, and even pulled 2 small ones. Of course they put her to sleep to work on her. And we now buy her dog food from the vet. It's one that's supposed to help clean her teeth. Does it work? Your guess is as good as mine.