The pain of 6 years old baby’s teeth is mostly caused by dental caries, the most important thing is to check the location of the caries. If it is the caries of front incisors, then we must distinguish whether it is the caries of milk teeth or permanent teeth, if it is confirmed that it is the caries of milk teeth, then for the age of 6 years old, we can consider pulling out the milk teeth directly, because the milk teeth will be alternated with permanent teeth around 6 years old, the milk teeth can be pulled out and wait for the permanent teeth underneath to erupt, but if it is the caries of newly erupted permanent teeth, then However, if the newly erupted permanent teeth are carious, then it is necessary to make decay and filling treatment at an early stage according to the scope of carious teeth to avoid further development of permanent teeth caries. For the decay of the posterior milk cusp and milk molar, it is also recommended to do decay filling treatment as soon as possible, because these three teeth still have several years before replacement, if these three teeth have decayed to the extent that they cannot be preserved, then it can be considered to extract them, and after extraction, it is also necessary to make a gap retainer for the milk teeth in the corresponding position to ensure the gap for the eruption of permanent teeth, so as to avoid the irregularity of the eruption of permanent teeth in the future. The situation of misalignment.