The most common culprits : overcooking and acidic dressings .

最常见的原因是：蒸煮过度和酸性调味料的添加。

Never brush immediately after an acidic meal or drink .

不要在吃完含酸的餐食或饮料后立即刷牙。

The clay-like phyllosilicates formed more than 3.5 billion years ago where igneous rock encountered water . Hydrated sulfates formed until about 3 billion years ago from the evaporation of salty and sometimes acidic water .

35亿多年以前，粘土状的层状硅酸盐形成于火成岩遇到水的地方；直到大约30亿年前，由于含有盐分的、有时呈酸性的水蒸发而形成了含水硫酸盐。

Reacts with acidic foods to alter taste .

会与酸性食物起反应，影响食物口味。

Vaginas are notably acidic environments .

阴道有明显的酸性环境。