Science teacher: *Shows a rock* this is Fluorite this is in our toothpaste.
Student: Can we brush are teeth with that?
Science teacher: Sure lets just scratch the crap out of our teeth!
17
Science teacher: *Shows a rock* this is Fluorite this is in our toothpaste.
Student: Can we brush are teeth with that?
Science teacher: Sure lets just scratch the crap out of our teeth!
