<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">dental enamel</topic></authority><related type="other"><topic>dentin</topic></related><related type="broader"><topic>tooth components as material</topic></related><variant type="other"><topic>enamel</topic></variant><variant type="other"><topic>enamel, dental</topic></variant> <note xml:lang="en"><![CDATA[ Intensely hard calcareous substance covering the dentin, that is, part or all of the crown of the tooth in mammals. Enamel, when mature, consists predominantly of apatite crystals containing calcium and phosphate. Enamel is the hardest tissue of the body; it is not living and contains no nerves. The thickness and density of enamel vary over the surface of the tooth. ]]></note></mads>