The only free and comprehensive online etymological dictionary of the Spanish language
diente m. (Noun) "tooth"
12th cent. From Latin dentem, accusative of dens 'id.' From Proto-Italic *dens- 'id.' From Proto-Indo-European *h3d-n̥t- 'id.' From earlier *h3ed- of the same meaning.
Indo-European
Romance
Asturian diente, Portuguese dente, Galician dente, Catalan dent, French dent, Italian dente, Aromanian dinti, Romanian dinte, Sardinian dènte
Italic
Oscan dunte ? (meaning uncertain)
Celtic
Old Irish dét, Welsh dant
Germanic
Gothic tunþus, Old High German zand
Balto-Slavic
Russian desná, Lithuanian dantìs, Old Prussian dantis
Hellenic
Ionic ὀδών (odón)
Armenian
Armenian atamn
Indo-Iranian
Sanskrit dánt-, Young Avestan daṇtan-