What is the best time to brush your teeth？

什么時(shí)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，但一天肯定不止刷這一次。

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.

酸性食物和飲料會(huì)軟化牙釉質(zhì)。如果飯后立刻刷牙，牙齒會(huì)更容易受到牙刷的磨損。牙刷造成的磨損和侵蝕變得越來(lái)越普遍，我們應(yīng)該多加重視。牙釉質(zhì)被橙汁之類的東西軟化時(shí)，用力刷牙會(huì)導(dǎo)致牙磨損，讓你的牙齒更加敏感。

牙釉質(zhì)脫礦的速度比再礦化的速度快得多。所以采取措施減少牙釉質(zhì)脫礦極為重要，這樣牙齒才有時(shí)間自我修復(fù)。

如果問(wèn)題在于牙膏影響了你的早餐食欲，那就使用不含硫酸月桂酸鈉（SLS）的牙膏吧。硫酸月桂酸鈉會(huì)影響你的味蕾，東西吃起來(lái)味道就會(huì)怪怪的。

There are several reasons for this：

原因有以下幾點(diǎn)：

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

夜間唾液分泌減少，經(jīng)過(guò)一整晚，細(xì)菌已在口腔內(nèi)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.

早上唾液中的鈣含量最低。因此，牙齒受細(xì)菌和酸性食物傷害的風(fēng)險(xiǎn)是一天中最高的。刷牙能讓前一晚減少的唾液加速分泌，并且牙膏里的氟化物與唾液混合后，能夠有效減緩酸性傷害。

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.

細(xì)菌只需要幾秒鐘就能讓糖分開(kāi)始代謝為酸性物質(zhì)。吃東西前就把細(xì)菌清理干凈，要比它們已經(jīng)大量攝取糖分，并產(chǎn)生酸性物質(zhì)后再刷牙明智得多。

Word Study

bacteria /b?k't??ri?/ n. （pl.）細(xì)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;過(guò)敏性

Some children develop a sensitivity to cows milk.