enamel, Hard outer layer of a tooth., toothpaste, cream used to clean and protect teeth., cavity , a hole in a tooth caused by decay., acid, substance (material) that can damage teeth, bacteria, tiny living things that cause plaque., foam, bubbles formed by a substance like toothpaste., flouride, ingredient in toothpaste that strengthens teeth., abrasive, ingredient in toothpaste that helps scrub teeth clean., sodium, A substance in toothpaste to clean teeth..

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