Saliva has bacteria.
The oral cavity is one of the five major reservoirs of bacteria in the human body, oral bacteria are high density and large in number, the bacteria in saliva exceeds 10 to the 8th power CFU/ml, saliva contains a variety of proteins that can provide rich nutrients for bacterial growth and reproduction.
Under normal circumstances, many bacteria residing in the oral cavity in an intricate manner, maintaining a relative balance between the flora, while maintaining a dynamic balance between the flora and the host, this dynamic balance is important for maintaining oral health, they are generally harmless or even beneficial to the host.
However, when oral hygiene habits, diet, age and other local or systemic conditions change, the normal flora will lose mutual constraints or microorganisms and the host to lose balance, it will become harmful, the formation of endogenous infections, exogenous infections provide the conditions or sensitization of the host and so on.
It is recommended to pay attention to oral hygiene, if there is discomfort, timely consultation, do not be negligent, so as not to delay the condition.