Abnormal eruption of the upper central incisors (commonly known as incisors and referred to as permanent teeth in this article) is more common in children, mainly manifesting as late eruption, blocking, and abnormal eruption of incisors. Many abnormal eruptions of incisors can be avoided or reduced if they are detected and treated early. Let’s get to know some of the rules of normal incisor eruption. Time rule: eruption is around six years old, early for girls and late for boys, with individual differences, upper incisors erupting later than lower incisors. Location pattern: The maxillary incisors erupt on the root side of the maxillary incisors (the mandibular incisors erupt on the lingual side of the milk teeth). Symmetry rule: the left and right incisors generally erupt at the same time Sequence rule: the incisors erupt before the neighboring teeth Familiar with the above rules, it is not difficult for parents to find signs of abnormal incisor eruption. Prevention is better than cure. Now the following tips: 1, develop the habit of regular oral examination for children; 2, the front teeth of the milk have been traumatic especially to regularly review; 3, the recurrence of periapical inflammation of the front teeth of the milk to take pictures; 4, more than 6 years old front teeth of the milk does not fall out, or no signs of loosening; 5, an incisor eruption, the other more than 3 months still has not erupted; 6, lateral incisors (second incisor) eruption and incisors have not erupted; 7, the lower incisors erupted The upper incisors have not erupted for half a year; 8.The “incisors” have erupted but have a strange shape, conical or nodular, often multiple teeth, which are often mistaken for incisors by parents; 9.The anterior milk teeth have not fallen out, and there is an abnormal bulge at the root tip.