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Enamel is the most solid and hardest tissue of the body. On the Mohs hardness scale, tooth enamel reaches 5, while glass and steel reach 5.5 and diamond, 10.
Since enamel is even resistant to the destructive effects of fire, it is not uncommon to use teeth as a source of DNA for forensic identification of human remains. Enamel is, however, very sensitive to acids and must be protected from them through the removal of dental plaque by tooth brushing.