same as in toothpaste. sodium monoflourophosphate or flouride
fluride
To keep your teeth a little cleaner and purify it. Always brush your teeth though
rottening
You keep your teeth in your mouth.
When washing dishes, turn off water when using soap. Also you can turn off water while brushing teeth, when you rinse, then you can uses the water.
To keep the teeth healthy
Rottening of wood is a chemical (breakdown) reaction
your teeth do not keep growing because if they did you wouldn't be able to close your mouth.
Just keep a cup (plastic, or a spare coffee cup) on the bathroom sink, fill it with your water, then shut off the water.
water by itself is harmless, but minerals in water can have an effect on teeth.
water does not really have an effect on teeth because there isn't anything in it to harm your teeth.
You should brush your dogs teeth with a specialized dog toothbrush and toothpaste. Also chewing on certain bones will keep their teeth clean!!
The cast of Teeth Are to Keep - 1949 includes: Allan Mills as Narrator