Another toothpaste question

If I understand correctly, water is fluoridated with the goal of getting fluoride into your body and eventually reaching your teeth.

So how does fluoride in toothpaste work?

Is there an assumption that you’ll swallow a little bit of toothpaste every time you brush your teeth, thereby getting fluoride into your body?

Or does the fluoride form a hard, microscopic layer on your teeth?

Topically applied fluoride binds directly to the enamel surface of the tooth.