From the first deciduous teeth began to fall off to the last baby teeth fall out, this period is called the replacement of deciduous to permanent (starting from 6 years old to around 12 years old, the replacement completed). During this period, both deciduous and permanent teeth in the mouth, that is an important period of establishing permanent relationship.

      Tooth is a very important chewing organ. There are two pairs of teeth in a person's life, which are known as the deciduous and permanent teeth. The eruption of the teeth is a complex physiological phenomenon, each tooth eruption have a certain time and order, the eruption time of left and right teeth with the same name is basically the same. The eruption time can be used as a sign of growth and development of children.

      Replacement period of children's oral both have permanent teeth and deciduous teeth, the difference between primary teeth and permanent teeth is:

      Deciduous teeth is smaller than the permanent teeth with the same name, color of deciduous teeth is white, it's gloss poor, and permanent teeth slightly yellow and shiny; the crown shape of deciduous teeth slightly rounded than the permanent teeth, neck narrowing, resembling buds; deciduous teeth in dentition period has been used for several years, anterior teeth cutting edge flush, posterior teeth abrasive wear, in contrast, permanent teeth just grow out of a period of time, its anterior cut end is in a jagged shape, posterior tooth peak is obvious.

      During this period, we should pay attention to the following points:

      1.Parents should understand the age and sequence of permanent teeth eruption out, especially obverse the teeth in the dental transitional period. If the deciduous teeth have loose or some permanent teeth have erupted, it is necessary to bring children to the hospital timely to remove of deciduous teeth;

      2. Deciduous teeth caries has not reached the dental transitional period, should be promptly to the hospital for treatment;

      3.New eruption of permanent teeth, if there are dental caries, abnormal arrangement, should go to the hospital timely for treatment.

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