Which is the hardest part in Human Body?

Femur and Temporal bone of the skull are the strongest bones of the human body. However, tooth enamel is the hardest and most highly mineralized substance in the human body. It’s a tissue and not a bone. This tissue has high mineral content which makes it hardest substance. Dental caries, most commonly called as cavities , are a consequence of demineralization process for the tooth enamel. Tooth cavities are caused when acids dissolve tooth enamel. The most common causative agents of dental caries are sugars from candies and soft drinks. This is because the bacteria in the mouth (most commonly Streptococcus mutans) react with sucrose sugar to produce lactic acid, which after some chemical reactions leads to demineralization of enamel.