Tooth Anatomy It’s relevance to Decay & Treatment Tooth Has Following Parts & layers. 1)Enamel 2)Dentin 3)Pulp 4)Crown 5)Root 1)Enamel Enamel is outermost layer of our tooth. It is a hardest part of our body. Because of its hardness, bacteria takes long time to penetrate this layer. Once they penetrate this layer, it will become easy for them to progress further. You don’t get any kind of sensitivity or pain when decay restricts in ename...