Assertion: electric toothbrush's bristle | /r/CapableOf | damage gum
Facets:
Source sentences:
text: Hard-bristled toothbrushes are wonderful if you’re going to clean the grout from your bathroom tile, but they’re not for use in the mouth,” says Messina, who explains that harder bristles can damage gums and enamel.
text: Harder bristles can damage the gums and don’t remove plaque any better than soft or medium bristles do.