The outside source applies color is because the tooth surface exists various germs, they secrete many sticky sex materials in the tooth surface, everyday the tea dirt in the food, smoke Zi, and drink aquatic and some mineral qualities and people the mineral quality within saliva adsorb on these sticky sex materials to form germ spot and tartar and make tooth yellow gradually or black.

外源性著色是由于牙齒表面存在著多種細(xì)菌全彩里番h无遮挡动态GIF图，它們在牙齒表面分泌許多黏性物質(zhì)日韩男女AAA，日常飲食中的茶垢成人人操、煙漬、以及飲用水中的某些礦物質(zhì)和人們唾液中的礦物質(zhì)吸附在這些黏性物質(zhì)上形成菌斑和牙石8人人操，逐漸使牙齒變黃或變黑国内自拍露脸在线视频。

Their saliva has antibacterial properties; it contains lysozyme, an enzyme that lyses and destroys harmful bacteria. Their short digestive tract is designed to push through food and bacteria quickly without giving bacteria time to colonize. The extremely acidic environment in the gut is also a good bacteria colonization deterrent. People often point to the fact that dogs shed salmonella in their feces (even kibble-fed dogs do this) without showing any ill effects as proof that the dog is infected with salmonella.

牠們的唾液有殺滅細(xì)菌的功能，其所含的成分可以很快制有害細(xì)菌為死地美女牲交一级a片免费；牠們很短的消化道是的食物和細(xì)菌很快的通過欧美性爱高清一区，致使細(xì)菌沒有繁殖的時間；膽道所分泌的高酸性膽汁也使有害菌沒有生長的環(huán)境永久福利影院；人們也會發(fā)現(xiàn)在健康狗狗的排泄物中可以發(fā)現(xiàn)沙門氏菌（有些喂食狗糧的狗狗也會有）日韩一级无码AV毛片免费并入，因而認(rèn)定狗狗感染了沙門氏菌。

In exceptional circumstances, a dream to the delicious food, will stimulate saliva secretion, saliva secretion increased, it will lead to drooling; improper sleeping positions sometimes lead to the phenomenon of flow of saliva; Some people sleep regularly teeth and stimulate the brain nerve center, to promote saliva secretion, so that flow of saliva; some people love spicy food thing, or, tobacco, liquor, so that night, dry mouth, increased saliva secretion; sleep, mouth breathing tends to dry mouth, thus contributing to an increase in saliva secretion ; In addition, some diseases, such as infectious stomatitis, toothache, mercury, potassium iodide poisoning, but also can stimulate an increase in saliva secretion, causing sleep drool.

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Baby teething can be to stimulate the distribution of the trigeminal nerve in the face, so that increase in saliva secretion.

孩子長牙時可刺激分布于面部的三叉神經(jīng)五月天天色图，使唾液分泌增加尤物网视频在线。