The incubation period of oral herpes is usually around 2-7 days. The source of infection mainly includes infected people and hidden infected people, during the epidemic infected people as the main source of infection, in the acute stage of the disease can be discharged through the pharynx of the virus, can be transmitted through direct contact, indirect contact or the use of virus-contaminated water, food, clothing and other ways, so the incubation period of oral herpes is generally in the range of about 2 to 7 days. Although oral herpes can occur throughout the year, but the summer and fall are more common, in the winter is more rare, was an epidemic after the trend of scattered occurrences, mostly in kindergartens, daycare centers and other crowded places, the family also has this kind of morbidity phenomenon of agglomeration, in order to prevent the occurrence of oral herpes, in order to prevent the occurrence of oral herpes, should be done ahead of time to prevent.