You know, the things the dentist would give you to dissolve in your mouth and show you the plaque on your teeth- has anyone ever seen them for sale in a store?
I wanted to buy them to show the boys that 5 seconds really is NOT long enough to get their teeth clean. I have found them online, but the shipping cost is more than 3x the cost of the tablets, so I was hoping to buy them at a store instead. Does anyone know where I could get them other than the internet?

Call around to dentists offices, or stop by one and see if they will give you some and explain to them why you want them. They will more than likley give you some.
Haha, My mom bought some of these from the dentist when I was 12. My sister and I both used them, they dyed our entire mouths red, as well as our chins and cheeks (drool, i guess) and stained the sink, too! We were two hours late to school that day because we spent all morning trying to scrub it off.