same as in toothpaste. sodium monoflourophosphate or flouride
fluride
Flourine is put into water to help prevent tooth decay
In many communities around the USA, trace amounts of fluoride are added to drinking water to reduce tooth decay.
acid
Something rottening and emitting stinking smell is called putrid.
rottening
To keep your teeth a little cleaner and purify it. Always brush your teeth though
You keep your teeth in your mouth.
Rottening of wood is a chemical (breakdown) reaction
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.
Fluorine is a gas which is often added to tap water. It is also used in toothpaste to keep teeth cleaner.
To keep the teeth healthy
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.