These teeth are baby or deciduous teeth. Later another set of thirty two larger teeth replace these teeth. The tooth is made up of an external crown and a root that is anchored in the jaw. The outer covering of the crown is made of enamel. Enamel is a very hard substance because it contains mineral salts such as calcium.
Mineral salts are also present in saliva.
These salts in saliva help add hardness to teeth. Underneath the enamel is dentin. Dentin is a bonelike substance that helps form the root. Bacteria Bacteria which are tiny colonies of living organisms are constantly found in the human mouth. It is normal for millions of bacteria to be in your mouth.