Tooth Brushing Before Breakfast or After? 刷牙要在早餐前还是早餐后？

What is the best time to brush your teeth？

什么时候刷牙最好？

The best time to brush your teeth is in the morning before breakfast. However， it certainly isnt the only time you should brush throughout the day.

早餐前刷牙最好，但一天肯定不止刷这一次。

4. Acidic foods and drinks will soften your enamel and make your 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 orange juice will lead to toothbrush abrasion and increased sensitivity of your teeth.

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， thus your teeth can recover.

If the issue is how toothpaste impacts your appreciation for breakfast， use a SLS-free toothpaste because SLS affects your taste buds and makes things taste odd.

酸性食物和饮料会软化牙釉质。如果饭后立刻刷牙，牙齿会更容易受到牙刷的磨损。牙刷造成的磨损和侵蚀变得越来越普遍，我们应该多加重视。牙釉质被橙汁之类的东西软化时，用力刷牙会导致牙磨损，让你的牙齿更加敏感。

牙釉质脱矿的速度比再矿化的速度快得多。所以采取措施减少牙釉质脱矿极为重要，这样牙齿才有时间自我修复。

如果问题在于牙膏影响了你的早餐食欲，那就使用不含硫酸月桂酸钠（SLS）的牙膏吧。硫酸月桂酸钠会影响你的味蕾，东西吃起来味道就会怪怪的。

There are several reasons for this：

原因有以下几点：

1. Bacteria have been multiplying overnight in an environment characterized by reduced salivary flow.

夜間唾液分泌减少，经过一整晚，细菌已在口腔内大量繁殖。

2. Salivary calcium levels are the 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 starts 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。刷牙能让前一晚减少的唾液加速分泌，并且牙膏里的氟化物与唾液混合后，能够有效减缓酸性伤害。

3. 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.

细菌只需要几秒钟就能让糖分开始代谢为酸性物质。吃东西前就把细菌清理干净，要比它们已经大量摄取糖分，并产生酸性物质后再刷牙明智得多。

Word Study

bacteria /b?k't??ri?/ n. （pl.）细菌

Some of these bacteria are actually good for you.

multiply /'m?lt?pla?/ v. （使）繁殖;增殖

It is possible to multiply these bacteria in the laboratory.

sensitivity /sens?'t?v?ti/ n. 敏感性;过敏性

Some children develop a sensitivity to cows milk.