Infectious stomatitis is bacterial essentially when of dental origin, the viral forms most often causing a vesicular and erosive stomatitis, and fungal secondary to a modification of the oral commensal flora. The diagnosis is often clinical with the lesions being of characteristic appearance and arising in a suggestive context. When the appearance is less typical or when the choice of treatment necessitates the identification of the germ, specific samples are taken. The treatment of viral stomatitis is essentially symptomatic, that of bacterial and fungal stomatitis comprising two arms: the specific treatment of the acute episode and then that of the particular oral-dental terrain.