Do normal hand soaps really kill germs? We're always told to wash our hands after going to the bathroom, but does this really make a difference?

I know this is a weird question, but would it be bad and unhealthy to brush your teeth with a regular bar of soap?

How does dandruff shampoo get rid of dandruff?

My toothpaste has flouride. What is it?

Where does my poop go after I flush, anyway?