Hardest substance in human body

The strongest substance in the human body is DENTINE,a very hard material which resembles bone in composition but contain no haversian canals.The exposed portion of the tooth is covered with a thin layer of ENAMEL, which is even stronger than dentine. This hard part starts developing by forming a cap of predentine secreted by odonoblasts and enamel matrix formed on this predentine layer from ameoblsats.