Final answer:
Sealants and water fluoridation are examples of preventive dentistry methods. They strengthen the teeth's enamel to prevent cavities, with community water fluoridation being a cost-effective strategy that has been shown to significantly reduce tooth decay in populations.
Step-by-step explanation:
Sealants and water fluoridation are examples of preventive dentistry. These strategies are vital in the fight against tooth decay, often referred to as dental caries, providing protection by strengthening tooth enamel and preventing the formation of cavities. Community water fluoridation is recognized as the most cost-effective method for delivering fluoride, reducing tooth decay by 25% in both children and adults. It involves adjusting fluoride levels in water to an optimal amount that safeguards against decay.
Fluoride, whether from water, toothpaste, or rinses, helps by reacting with hydroxylapatite in the teeth to form a more acid-resistant form known as fluorapatite. This frequent and consistent contact with fluoride helps to rebuild weakened tooth enamel, keeping teeth strong and solid. Moreover, sealants are a physical barrier applied to teeth, adding another layer of defense against decay. Good hygiene practices, like regular brushing with fluoride toothpaste and flossing, also play an important role in preventing decay.