because it wears the enamel off your teeth and makes them vulnerable and unprotected
The reason your teeth may hurt is because you may not brush your teeth enough, or you just need to make sure you don't put very much pressure on your gums when you are brushing. If that doesn't work, you should go and buy a softer bristle tooth brush. It will surely make a difference.
You can use as much water as you want when you brush your teeth. The amount varies from person to person.
3 times a day
About a half cup
100 gallons
Of course they do- they are mammals and have teeth very much like yours. Go brush them.
Too much can cause acid erosion to teeth.
The amount of water it takes to brush teeth can depend on the person. The average person probably uses about a cup of water.
Electric toothbrushes are brilliant! And so easy to use, I feel they do a much better job of cleaning your teeth. Hope this helps PY
People who eat too much candy or chocolate. Or someone who doesn't brush their teeth often.
it may take up to 1 gallon to brush your teeth. However, you should save water by using a glass, if you did that, you would use about a seventh of that.
if you brush your teeth for two minutes, then you waste an average of 10 litres per person. So turn the tap off!