In the Hindu religious tradition, the tulsi, or holy basil, plant serves both as an important symbol and also as a popular medicinal remedy.
Diamond use to be the hardest known natural substance now it is the mineral lonsdaleite at 58% stronger then diamond is the first the second hardest is wurtzite boron nitridâ¦e at 18% stronger then diamonds they are both extreamly rare natural minerals sources http://www.newscientist.com/article/dn16610-diamond-no-longer-natures- ...
Enamel is the hardest and the most mineralized substance in the human body. It is the outer most layer of the tooth that naturally protects the inner layers of the tooth. If the enamel softens with a caivity then it can no longer protect the tooth and the tooth can become sensitive.