ANSWERS: 2
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The dye in "plaque disclosing tablets" is usually Erythrosine (FD&C red #3) which is also used as food coloring and is typically harmless. One tablet should do no harm. The same coloring is used in frosting, popcicles, and other common foods. It has been implicated as a carcinogen, which is why it is recommended that you spit it out.
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Haha. I have done that before and thought I was going to die. But I'm here today to tell the (embarrassing) story so no, it won't do him any harm. :)
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