Is fluoride good or bad for you?
So here's the thing. I recently bough toothpaste from a health-food store because I wanted to buy toothpaste that was not tested on animals. When I was brushing my teeth, I noticed that it said "fluoride-free." I thought, Now why would anyone want that? Fluoride is GOOD for you, isn't it? After doing some research, some people say it's dangerous and unnessecary while others say it's beneficial. Obviously I don't want to be brushing my teeth with non-fluoride toothpaste if that's going to make them fall out of my head... but I don't want cancer from fluoride either. So which is it?
What type of toothpaste will clean stained teeth the best?
That is my science fair project. I will be using tartar control toothpaste, fluoride toothpaste and non-fluoride toothpaste.
-How do I record the shades of the stained and clean teeth?Is there some kind of machine I can use?
-Where could I get actual teeth?Dentist?
-What would be a good hypothesis?Has to be an "If......then......"hypothesis
-How I properly stain them.