Posterior molars, or molars, will generally begin to be replaced around the age of 8 to 11 if they are children’s milk molars, and will not be replaced if they are permanent molars. Children’s molar teeth will be replaced during the replacement period, with premolar teeth replacing the molar teeth as permanent teeth, and the replacement usually takes place between the ages of 8 and 11. However, in the case of permanent molars, they are not replaced. On average, the first permanent molar in the upper and lower jaw erupts around the age of 6 years, and the second permanent molar erupts around the age of 12 to 13 years. Regardless of whether it is a molar or a permanent molar, you should pay attention to keeping your mouth clean and hygienic, rinsing and brushing your teeth diligently, and developing good oral care habits to ensure your oral health. If dental caries exists, it is recommended to treat it in time so that it will not develop into pulpitis and other conditions in the later stage.