目的：评价含氟或无氟牙膏对酸蚀釉质刷牙磨损的影响。
AIM: to evaluate the effect of fluoride in toothpaste on brushing abrasion of eroded enamel.
汤姆的缅因州无氟儿童牙膏的使用自然来源的钙和二氧化硅磨料，轻轻地清洁牙齿。
Tom's of Maine Fluoride-Free Children's Toothpaste uses naturally sourced calcium and silica abrasives to gently clean teeth.
汤姆的缅因州无氟儿童牙膏的使用自然来源的钙和二氧化硅磨料，轻轻地清洁牙齿。
Tom's of Maine Fluoride-Free Children's Toothpaste uses naturally sourced calcium and silica abrasives to gently clean teeth.
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