不刷牙睡觉 VS 不刷牙吃早餐，哪个更伤身？答案出乎意料

忙碌一天后，很多人累得连洗漱都顾不上，倒头就睡；早晨被闹钟叫醒，又常常来不及刷牙，抓起一块面包就匆匆出门。

答案是：睡前不刷牙，对口腔健康的危害通常更大。睡前刷牙是预防蛀牙、维护牙周健康的重要措施。

Brushing your teeth before bed is generally more important for oral health than brushing before breakfast, as plaque left on teeth overnight can increase the risk of tooth decay and gum disease.

睡觉前不刷牙 = 细菌狂喜！

不过，口腔中的细菌并不都会引发疾病。日常刷牙、使用牙线，以及唾液的冲刷和缓冲作用，都有助于控制菌斑、减少酸性物质对牙齿的损害。

Bacteria in the mouth feed on food particles and produce acids that erode tooth enamel. During sleep, saliva production decreases, reducing its ability to wash away bacteria and neutralize acids. Without brushing, plaque and food debris remain on teeth for hours, increasing the risk of cavities, gum inflammation, and bad breath.

早餐前刷牙：吞下细菌，没事！

一方面：这些细菌本身进入我们的消化道之后，会被胃所分泌的胃酸消灭绝大部分；

另一方面：其实细菌也没有那么可怕，消化道中也有诸多细菌存在，它们多数都是我们消化食物的帮手，并不会致病。

但这并不意味着早晨可以省略刷牙。咀嚼食物和唾液分泌虽然有助于清洁口腔，却无法有效替代刷牙和使用牙线。牙菌斑仍会附着在牙齿表面，长期积累可能增加蛀牙和牙龈疾病的风险。

Swallowing some oral bacteria while eating breakfast generally poses little risk, as stomach acid kills most of the bacteria that enter the digestive tract.

However, morning brushing should not be skipped. Chewing and saliva flow cannot replace brushing and flossing in removing plaque.

睡前必须刷，早上也要刷  

Dentists recommend brushing at least twice a day with fluoride toothpaste, paying particular attention to brushing thoroughly before bed. Flossing also helps remove plaque and food debris between teeth. After brushing at night, avoid eating again if possible.

Although it is impossible to eliminate all bacteria in the mouth, regular brushing helps control plaque buildup and reduce its harmful effects.