Too much dye per tab
It definitely works as it should.  We have used other similar products before, so didn't need instructions.  But, I did find that this product has more dye than previous tabs we have used.  When my son chewed the whole tab, his whole mouth (lips, teeth, gums, tongue, heck even his uvula) turned purple. So, I have my son bit a smaller part of the tab to chew, and we toss the other part.  Small kid, small mouth, too much dye.
Rating: 3 stars