Advantage Arrest can be applied near the gingival with little concern.  If accidental contact occurs it is not harmful or caustic.  The contact will result in a temporary staining of the soft tissue that will fade to nothing in a few days.  If liquid Advantage Arrest is in contact with the soft tissue for extended periods, some blanching may occur, but it is not harmful.  Do not apply near the gingival if there are open wounds, stomatitis, or ulcerative gingivitis as Advantage Arrest will be an irritant.