|
Fancy toothpastes may come in different colors and boast unusual ingredients, but they probably don't offer better dental health than the average drugstore toothpaste. Here's what to look for if you try a new brand: 高档牙膏可能有不同的颜色、独特的成分，但它们对牙齿健康所起的作用并不一定比药店售卖的普通牙膏更好。如果你想换个牌子，应注意下列事项。 Abrasives 磨擦剂 Toothpastes provide a little mechanical help with scrubbing; that's the main reason they exist. Particles of grit help to scrape bacterial plaque from your teeth. Some common abrasives include calcium carbonate, silica, aluminum oxide, and magnesium carbonate. Charcoal can also act as an abrasive, but some dentists caution that charcoal can be too harsh. 牙膏中的粉状磨擦剂在牙刷来回抽动下机械地刷除牙渍，所以牙膏会含有磨擦剂。磨擦颗粒有助于刷除牙菌斑。常见的磨擦剂包括碳酸钙、二氧化硅、氧化铝和碳酸镁。木炭也可以用作磨擦剂，但有些牙医警告称，木炭可能太过刺激 Fluoride or (maybe) an alternative 氟化物或可能的替代品 Bacteria are constantly dissolving your teeth, and your teeth are constantly trying to build themselves back up. (Your saliva naturally contains calcium to aid in this process.) This process, called remineralization, is helped along by fluoride. All toothpastes that have an American Dental Association seal must contain fluoride. | 
