Assertion: electric toothbrush's brush head | /r/CapableOf | vary in the firmness of the bristles
Facets:
value: with being firmer
type: OTHER
Source sentences:
text: Brush heads tend to vary in the firmness of the bristles, with many standard heads being firmer than you might like, or are desirable when you have sensitive teeth and gums.
text: Brush heads tend to vary in the firmness of the bristles, with many standard heads being firmer than you might like, or are desirable when you have sensitive teeth and gums.