The hard, yellowish tissue that makes up the bulk of a tooth, lying beneath the enamel.
From Latin 'dens' (tooth) with the suffix '-in,' creating a material noun. This scientific term emerged as anatomists and dentists needed precise vocabulary for tooth structure components.
Dentin is softer than enamel but harder than bone, and it contains tiny tubules that connect to the nerve—that's why exposed dentin causes tooth sensitivity, because those little tunnels lead straight to pain signals!
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