Show changes in Hur human nari teeth Th that atour our teeth are becoming progressively gres smaller and fewer ewer Is made mada manifest by q a study of human jaws running back through the centuries to the earliest historic times years aga ago and even to those of prehistoric people whose bones have leen been dug ul up that they are growing less durable Is shown by their extreme liability to io decay the tendency to a reduction la in the number of teeth Is shown by the departure of the third molars these wisdom teeth as they Q are called four in number are in many als missing or undersized and irregular or they may in other instances fall to erupt B evidently vi dently they are destined to disappear entirely and because they are colonger no longer required for use nature Is making them of such poor material that commonly comi they start to decay as soon ats as they appear already there are signs that other othar teeth such as the lateral laderal incisors will follow the same route our teeth are merely tools they are not equi equivalent valeni to limbs but are only natural implements and were ivere developed originally to meet certain needs it if the n needs diminish il the teeth teeth epst do likewise |