The oral mucosa is the target of a number of infectious processes caused by a range of organism. Viruses is one of the organism which is considered in oral mucosa damage. Recently, the main viruses causing oral mucosal infections are the large herpes group. This article discuss herpes simplex virus and varicella zoster virus that cause herpetic stomatitis and gherpes zoster with particular attention to the typical oral manifestations current treatment options. Dentists should recognice the clinical appearances of the diseases, so the appropriate therapy can be done.