Julie1, that's really good advice. I also use a finger brush on Oscar. He's not a big fan of having his teeth brushed either, but I just try to encourage him. It gets a little easier all the time.
Is Bella a puppy? When Oscar was teething, his breath smelled like something had died. One day when I was brushing his teeth, two fell out! After he lost those the breath problem went away. Keep trying!!!
