noun
comb teeth
Refers to the individual teeth of a comb. The reading しつし is rare and mostly found in technical or historical contexts.
この櫛は櫛歯が細かい。
This comb has fine teeth.
櫛歯の間のほこりを取る。
Remove the dust between the comb teeth.
櫛 means 'comb' as a whole, while 櫛歯 specifically refers to the teeth of a comb.
Compound of 櫛 (くし, 'comb') and 歯 (は, 'tooth'), with rendaku voicing of は to ば. The reading しつし is the on'yomi reading, rarely used.