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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