Yes!
Here is a simple easy way to test its effects. 1. After waking up in the morning, cup your hands around your mouth and nose and and smell your breath. After you pass out you will regain consciousness. 2. Immediately go and brush your teeth (twice). 3. Repeat step one. If you have not passed out, or lost consciousness the brushing was a success.
You can also substitute cupping your hands over your mouth and nose for another person. Just breath directly into their face.
yes, it works because the flouride it contains prevents gum decay which eventually leads to tooth loss if you dont use it. it can also whiten teeth over time (depending on the minerals and substances inside). it is a very good idea to use liquid flouride too, like listurine to kill the germs and strengthen your teeth.