Q: What is the best time to brush your teeth?
问：什么时间刷牙最好?
Answered by Scott Frey
Scott Frey的回复：
The best time to brush your teeth isin the morning before breakfast.However, it certainly isn't the only time you should brush throughout the day.
早饭之前刷牙最好，但一天一定不止刷这一次。
There are several reasons for this:
缘由有以下几个方面：
1. Salivary calcium levels are lowest in the morning. Thus, your teeth are at a much higher risk of acidic damage from bacteria and dietary acids in the morning than at any other time. Brushing kickstarts salivary flow that has been reduced overnight and adds in fluoride to the mix which will help buffer against acids.
早上唾液中的钙含量最低。因此，牙齿受细菌和酸性食物伤害的风险是一天中最高的。刷牙能让前一晚降低的唾液加速分泌，并且，牙膏里的氟化物与唾液混合后，可以有效减缓酸性伤害。
2. Bacteria take seconds to begin to metabolize sugars into acids. Clearing them out before the introduction of food makes far more sense than brushing after they have already soaked up sugars and produced acids especially considering point #1.
细菌只用几秒钟就能让糖份开始代谢为酸性物质。吃东西前就把细菌清理干净，要比它们已经很多摄取糖分，并产生酸性物质后再刷牙明智得多，特别是在考虑到第一点的状况下。
3. Bacteria have been multiplying overnight in an environment characterized by reduced salivary flow.
夜间唾液分泌降低，经过一整晚，细菌已在口腔内很多繁殖。
4. Acidic foods and drinks will soften your enamel and make you teeth more vulnerable to toothbrush abrasion if brushing immediately after meals. Toothbrush abrasion and erosion are becoming increasingly common so we need to pay greater mind. Scrubbing on your teeth when your enamel has been softened up by something like OJ will lead to toothbrush abrasion and increased sensitivity of your teeth.
酸性食物和饮料会软化牙釉质，假如饭后立刻刷牙，牙齿会更容易遭到牙刷的磨损。现在，牙刷导致的磨损和侵蚀变得愈加常见，大家应该多加看重。牙釉质被橙汁之类的东西软化时，用力刷牙会致使牙磨损，叫你的牙齿愈加敏锐。
The process of enamel demineralization occurs much more rapidly than remineralization,so it is extremely important to take steps to limit the extent of demineralization throughout the day so your teeth can recover.
牙釉质脱矿的速度比再矿化的速度快得多。所以在一整天中，采取手段降低牙釉质受损极为要紧，如此牙齿才有空闲自我修复。
If the issue is how toothpaste impacts your appreciation for breakfast, use a SLS|free toothpaste because SLS affects your tastebuds and makes things taste odd .
假如问题在于牙膏影响了你早餐的食欲，那就用不含硫酸月桂酸钠的牙膏吧。硫酸月桂酸钠会干扰你的味蕾，东西吃起来味道就怪怪的。出于其他一些缘由，你也应该用不含硫酸月桂酸钠的牙膏。
