> As the teeth grow and appear in the mouth, microbial plaque is also formed on it and starts to decay and decay, so the child's oral and dental hygiene begins with the growth of the first milk tooth. Child and dentist The best time for a child to start visiting the dentist is around 9 months old, and the habit of visiting the dentist regularly can prevent the occurrence of oral and dental diseases. finger sucking Finger sucking is a natural reflex for a child up to 2 years old and gives him a sense of comfort and relaxation. After 2 years of age, finger sucking is gradually forgotten and stopped, and until 4 years of age, if it is not stopped, it increases in intensity, which is a sign of the mental passivity of the child. Loss of milk teeth If the severity of the decay of the milk tooth is so severe that there is no other option but to extract it, after extracting the tooth, the dentist will prevent the teeth from moving and moving forward by making a device called Space Maintainer, and as a result, the necessary space for the proper growth of the permanent tooth will be maintained. Irregularity and irregularity of teeth Hereditary factors, large teeth and small jaw, early loss of milk or permanent teeth, mouth breathing and finger sucking are among the causes of irregular teeth and their wrong relationship. In addition to dry mouth and inflammation of the gums in the front teeth, mouth breathing causes the order of the teeth to be messed up. Improper teeth also affect oral health. It is difficult to clean the teeth irregularly, and for this reason, the rate of caries and inflammation of the gums is higher in these people. Irregular teeth, in addition to increasing susceptibility to decay and gingivitis, cause muscle tension, facial symmetry and facial attractiveness, and jaw pain, and make it difficult to chew food, and the patient inevitably turns to soft foods.