Containing added fluoride, especially referring to water or toothpaste that has been treated with fluoride.
Past participle of fluoridize, from fluoride + -ized (treated with). The term emerged in the mid-20th century as fluoridation became a standard public health practice.
Most toothpaste you buy is fluoridized, and that's why brushing your teeth helps prevent cavities—the fluoride chemically bonds with your tooth enamel to make it harder and more resistant to acid attacks from bacteria.
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