DEFECTIVE TEETH.--Unless suitable precautions are observed, the digestive disturbances of pregnancy have a tendency to injure the teeth. The regurgitation of the acid contents of the stomach, for example, may cause cavities to develop or may enlarge those that already exist. In all probability the damage done in this way--and not the removal of lime from the teeth for the formation of the child's skeleton, as some have thought--is responsible for the origin of the saying that "every child costs a tooth." This notion is of course absurd, yet it is quite true that toothache and the decay or loosening of the teeth are not infrequently associated with pregnancy. On this account, throughout the period of pregnancy particular care should be given the teeth. One of the very first duties of a prospective mother, after she knows that conception has taken place, is to visit her dentist. This step is very important as a means of insuring the teeth against such harmful influence as pregnancy may have upon them. If the dentist finds the teeth in poor condition, the patient should consent to have them treated immediately. That this is the reasonable course seems sufficiently obvious, yet the majority of women have been slow to adopt such a view. For a long time dental work of every description was incorrectly believed to have an untoward effect upon the development of the child; and the extraction of a tooth, it was thought, would surely be followed by miscarriage. Although the extraction of teeth is not frequently undertaken nowadays, I have known several prospective mothers who required the operation, and who had it performed without experiencing a single untoward symptom. Very naturally dental work should be restricted during pregnancy to that which is absolutely necessary, and temporary fillings generally suffice; but whatever is needed should be done without delay. Brushing the teeth after meals and removing particles of food that may have been caught between them--important enough at all times--are of even greater importance during pregnancy. If the gums are sore and the teeth show a tendency to loosen, the best tooth-paste is one containing potassium chlorate.