Ngelixa kukho imithetho elawula ukusetyenziswa kunye nokuthengiswa kweendlela eziluhlaza, azikho ngokungekho ngqiqweni.
Iklasi IIB okanye izixhobo ze-IV ze-IV ze-IV, ezaziweyo zokukhupha amanqanaba amanqanaba abalulekileyo kwaye zinokubangela ukungaboni kakuhle emehlweni umntu, zizinto eziluhlaza zibhekiswa ngqo kwi .
Le mithetho ikwindawo yokukhusela ukhuseleko loluntu nokuqinisekisa ukuba abars aluhlaza kuphela aqeshelwe ukusetyenziswa kuphela, njengokusetyenziswa okufanelekileyo, njengokwemikhosi, ezorhwebo, kunye nophando lwezenzululwazi.
Ngaphaya koko, ngenxa yesidingo esandayo seempahla eziluhlaza, zininzi izinto ezisemgangathweni eziphantsi, ezingenamsebenzi kwintengiso .
Ukuqinisekisa ukusetyenziswa okukhuselekileyo nokuxanduva kwezi ngqeshiso zinamandla, kubalulekile ukuthobela imigaqo kunye nezithintelo ezimiselwe yimizimba.