The oral microbiota can be altered by a series of endogenous and exogenous factors such as diet, smoking, alcohol, antibiotic treatments or pregnancy.

口腔微生物群可被一系列内源或外源性因素影响，例如饮食、吸烟、饮酒、抗生素治疗或怀孕。

Exterior syndrome is mild with superficial location and serious with deep location. Interior penetration of the exogenous pathogenic factors indicates progress of the disease while exterior withdrawal of the endogenous pathogenic factors suggests alleviation of the disease.

表证是在浅表是轻缓的，深而入里就危重。表邪入里为病进，里邪出表为病退。

Exterior syndrome, usually seen at the early stage of exogenous diseases marked by sudden onset and short duration, is usually caused by invasion of the six exogenous pathogenic factors into the body through the skin, mouth and nose.

表证，通常出现在以起病急、病程短为特点的外感疾病的早期阶段，通常是由六邪通过皮肤、口和鼻侵入人体引起的。