Assertion: electric toothbrush's head | /r/CapableOf | reach back teeth
Facets:
Source sentences:
text: It differed from previous toothbrushes in three ways: it had an angled head, similar to dental instruments, to reach back teeth; the bristles were concentrated more closely than usual to clean each tooth of potentially cariogenic (cavity-causing) materials; and the outer bristles were longer and softer than the inner bristles.