When I was a kid, the dentist gave me these little purple pills. I would put them in my mouth and they would dissolve. They would turn all the plaque in my mouth purple, so my teeth would be all purple. So basically, I knew I hadn't brushed my teeth good enough until all the purple was brushed away.

I've been searching like crazy for them. All the pharmacies look at me like I have a second head. My mom swears I never took such a thing.

Does anyone know what they're called or where I can get them? My son does such a lousy job brushing his teeth, I know they'd help!

Thanks!