Etymology
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toothsome (adj.)
"pleasant to the taste," 1560s, from -some (1) + tooth in a figurative sense of "appetite, taste, liking" attested from late 14c. (compare sweet tooth, also figurative use of palate). The extended sense of "attractive" (1550s) is attested earlier. Related: Toothsomely; toothsomeness.
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sweet tooth (n.)
"fondness for sugary stuff," late 14c., from sweet (adj.) + tooth in the sense of "taste, liking" (see toothsome).
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*dent- 

Proto-Indo-European root meaning "tooth."

It forms all or part of: al dente; dandelion; dental; dentifrice; dentist; dentition; denture; glyptodon; indent (v.1) "to make notches;" mastodon; orthodontia; periodontal; teethe; tooth; toothsome; tusk; trident.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit danta, Greek odontos (gen.), Latin dens, Lithuanian dantis, Old Irish det, Welsh dent, Old English toð, German Zahn, Gothic tunþus "tooth."

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