Because it can catch another germ or virus
The tooth's outer layer consists of the Enamel, Dentin and the Pulp.
<h3>What is a tooth?</h3>
A tooth is a hard resistant structure that is located in the mouth for crushing down before swallowing and digestion.
The tooth's outer layer consists of the Enamel, Dentin and the Pulp. The Enamel is the toughest of them all and located at the top layer of the teeth while the dentin is beneath the enamel layer of the teeth with the pulp in the middle.
Learn more on tooth layer here: brainly.com/question/10929330
#SPJ11
1 is Exercising
2 is bodies
3 is mechanics
