一副好牙要從小保護(hù)，美國專家專注兒童齒健康【生詞摘錄】
The use of fluoride to protect teeth is common in many parts of the world. This natural element is often added to drinking water supplies. The fluoride mixes with enamel, the hard surface on teeth, to help prevent holes, or cavities, from forming. But the American Academy of Pediatric Dentistry po…