6 years old is just the period when children’s milk teeth are replaced by permanent teeth. At this time, we should consider whether the bad teeth are milk teeth or permanent teeth, and different treatment methods are used for different teeth: a. Milk teeth: If the milk teeth are bad and rotten, you can check first to see if the teeth can be repaired by using treatment methods such as fillings, and wait for tooth replacement. If it is really impossible to treat and repair, then this situation can be treated by tooth extraction, pull out the bad milk teeth and wait for the new permanent teeth to grow out, and if necessary, perform gap retainer treatment. Pay attention to oral hygiene and eating habits to prevent the new permanent teeth and other teeth from breaking down again. Second, permanent teeth: 1, root canal treatment: If the permanent teeth are bad and rotten, then you should try to take conservative treatment, you can use root canal treatment to repair the tooth parts. Root canal treatment is to open the diseased part of the tooth, with special instruments to remove the bad pulp tissue, through the cleaning and disinfection, filling into the dental material and paste three-dimensional filling root canal; 2, dental implant treatment: If the bad part of the tooth is larger, serious damage to the pulp and periodontal tissue, it is necessary to remove the previous teeth, plant artificial teeth. Children’s bad teeth are often related to bacteria and diet, so usually pay attention to oral hygiene, such as rinsing after eating, brushing in the morning and evening, etc. You should also control the intake of sweets to protect your teeth.