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caries tooth decay dental cavities plaque bacteria enamel acid prevention treatment oral hygiene fluoride sugar diet risk factors toothbrush toothpaste saliva demineralization remineralization fillings root canal erosion gingivitis periodontitis health acidic foods visit xrays sealants mouthwash gum sensitivity restorative care examination surface preventive dentistry cleaning cavity filling buildup intake checkup protection repair restoration bacterial growth drinks healthy teeth control