Because the rats belong to anechoids, their teeth and other animals are different, their teeth back to the continuous growth, if you do not find some harder things to molar, then ... I do not want to say You will know the results! Oh !, more to see the animal world it ~ just fine I just look at the above know.
The mouse is an aleks and is different from the teeth of other animals. The teeth of other animals grow to a certain extent will not be long. And the teeth of the rats are long in their lives. If you do not find some hard things to wear short teeth, the rat's teeth will worn lips, affecting survival, so the mice often bite the situation of the wood.
In addition to wood, rats occasionally find some other hard things to molars, such as soap and so on.
