Originally Posted by Speed Racer
These people are obviously having a laugh at your expense, because I've never heard of anyone brushing a horse's teeth.
Horses' teeth grow constantly until they're about 25-27 y/o. After that, there just isn't any more left to grow out. Because of this constant growth, a domestic horse's teeth need to be floated at least once a year.
If your horse's teeth are rotting out of its head, there's something seriously wrong with the animal and you need to call a vet.
Yup, what I was going to say.
The reason human's teeth get cavaties is because we eat "unnatural" foods, like sweets, sugary drinks, and acidic foods. Horses is grass, hay, and small quantities of grains or feed. They don't eat anything that would cause tooth decay.
The only reason a horse's tooth may rot is if it is cracked and bacteria can get in to the root. If that happens, the vet has to extract the tooth.