brushing your cat's teeth

[Hoof Hearted]

Actually, dry food is one of the main causes of dental issues in cats.

Dry food particles stick to their teeth and create areas for bacteria to colonize, damage teeth and irritate gums. Canned food is a bit better, mostly because it doesn't stick to the teeth as badly, but the available commercial foods and products (treats) we use really do not make much difference for a cat's oral health.
Dry food/treats shatter at the tips of the teeth, they do not scrape any accumulated matter off the teeth when they shatter, so that usually only adds to the problem of buildup.

The very best thing? Meat/bones.
Their diet in the wild is small prey which they chew, gnaw and crunch through. I bet, if you would give your cat a raw chicken wing to chew/gnaw on at least once a week, the act of the carnassial teeth shearing the flesh away from the larger bones and even crunching through the smaller bones, will do much more for scraping along and cleaning the teeth of buildup from commercial dry foods.

http://www.felinefuture.com/nutrition/bpo_ch4a.php