The bristles of a toothbrush must be very dense so we can clean our teeth and gums as thoroughly as possible, and very soft so we don’t hurt our gums while brushing.
Ščetine zobne ščetke morajo biti zelo goste, da lahko svoje zobe in dlesni čim bolj temeljito umijemo, ter zelo mehke, da z njimi med ščetkanjem ne poškodujemo dlesni.