Assertion: electric toothbrush's bristle | /r/HasProperty | indicator bristles
Facets:
Source sentences:
text: The bristles are of medium firmness and there are even indicator bristles that tell you when you need to replace the brush head.
text: Commonly seen on electric toothbrush heads, some (but few) manual toothbrushes have bristles that have been dyed a particular color and are known as indicator bristles.