It is normal to have four teeth at the age of six.
The period of permanent teeth eruption is usually around six years old, that is, at the age of six years old, four big teeth (clinically known as six-year-old teeth) erupt at the end of the milk teeth, but the eruption time varies according to individuals, generally girls change their teeth relatively earlier than boys, but the eruption of four teeth at this age is a normal phenomenon.
During the period of permanent teeth eruption and replacement, since the newly erupted teeth (especially the six-year-old teeth) are not yet fully developed, good oral care should be taken during this period in order to avoid the symptoms of dental caries or pain; and the fissure sealing treatment can be carried out in time after the eruption of the six-year-old teeth in order to prevent the occurrence of dental caries effectively.