But I really didn't like it. I wanted to have the kids try ...
It works.  But I really didn't like it.  I wanted to have the kids try something to show them how well they need to brush.  But it's a bit too strong.  When I tried it the purple showed up strong on an amalgam filling on one of my front teeth and I was in a panic that it wouldn't come out.  It finally did come out.  But it took a lot of brushing.  If this is what you like, I would recommend not using a whole one at one time.  It takes just a small piece to get your teeth purple.
Rating: 2 stars