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After eating, a sticky coating called plaque forms on our teeth. We must brush off the plaque or it could turn teeth from a nice pearly white to a dour yellow or brown. Plaque can also lead to cavities, which are no fun at all. This activity uses a hard-boiled egg as a pretend tooth and shows what happens if plaque goes unchecked. Reluctant brushers might change their attitude after seeing the results of this amazing experiment!