Tooth-comb

When the Arabs speak of things as alike in respect of good qualities, they call them 'as like as the teeth of a tooth-comb;' whereas, if they speak of similarity in bad qualities, they say 'as like as the teeth of an ass.'

Source: wiktionary

Thin-skinned dunces, too, in power, hate satire, to use Sidney [i.e., Sydney] Smith's simile, for the same reason as "fleas detest tooth-combs," because they cannot escape it.

Source: wiktionary

Must interest has centered on the first appearance of the prosimian tooth-comb or tooth-scraper [...]. The tooth-comb is formed by lower incisors and canines that are elongated and slender, and that form a procumbent unit in the anterior mandible. Upper incisors are lost, reduced, or moved to accommodate the tooth-comb.

Source: wiktionary

8.15 am. Tooth-combed seven heads, had grand sport; mixed bag, measured one teaspoonful; cleanliness is next to godliness!

Source: wiktionary