Ubuchwepheshe bokushisa bokushisa bokushisa kwe-oyili, umthamo wokushiswa kokushisa ungaphezu kwezikhathi ezingama-200 zokupholisa umoya, ukusetshenziswa kwamandla kungamaphesenti ama-5 kuphela wokupholisa umoya, isilinganiso sokusebenzisa kabusha imishini, amandla aqinile ...