Ma slabs opukutidwa a quartz amawala kwambiri.Ndilo gawo lofunikira la chipinda chathu chakukhitchini chomwe timagwiritsa ntchito tsiku ndi tsiku.Kupatula pamwamba, ndi wathanzi.Anthu amatha kuyika chakudya pamtunda ndipo palibe vuto lililonse paumoyo.
Palibe nkhawa tsiku ndi tsiku ukhondo chifukwa chonyezimira pamwamba ndi zopangira palokha khalidwe ngati palibe pores, madzi mayamwidwe mlingo otsika, utsi n'zosavuta kulowa ndi mabakiteriya ndi nkhungu n'zosavuta kukhala parasitic .