I use the small end of a dual sided doggy toothbrush for their molars/ back teeth & the small (I think it's a cat) toothbrush from CET for their front teeth. I also use the CET toothpaste. My 4 have their own toothbrushes (8 in total loll!) & I brush their teeth every night b4 bedtime.
Afterwards, they get bunches of kisses!