口腔内有很多种细菌,有人曾经作过检验,可培养出者有28种之多。细菌在口腔内的量很大,每一毫升唾液含有10~(8-9)个,在牙菌斑内的细菌量就更多了。由于口腔内有一定的湿度,也有适宜的温度,再加上有充足的营养,如蛋白质、氨基酸、糖类、维生素、氧等,都为细菌的生长和繁殖提供了很有利的条件。 There are many kinds of bacteria in the oral cavity, some people have done tests, can train those who have 28 kinds. Bacteria in the mouth a large amount of saliva each containing 10 to (8-9), the amount of bacteria in the plaque more. As the oral cavity has a certain humidity, but also the appropriate temperature, coupled with adequate nutrition, such as protein, amino acids, carbohydrates, vitamins, oxygen, etc., all for the growth and reproduction of bacteria provides a very favorable condition.