Bad tooth is good for filling or extraction specifically need to check whether the tooth can still be retained, there is retention value of the tooth is recommended for filling, no retention value of the tooth is recommended for extraction. 1. Retention. Bad teeth need to go to the hospital for oral and x-ray examination, teeth, if only caries, teeth, periodontal inflammation in general, can be retained for treatment, according to the situation of root canal treatment after resin filling, and then do the crown can be dealt with. 2. Extraction. If the tooth has appeared 3 degrees of looseness or root longitudinal fracture, periodontal inflammation is more serious, after treatment to confirm that there is no value for retention, it is recommended to extract the denture repair. Whether it is better to fill the broken tooth or extract it, you need to go to the hospital to do a complete examination to confirm.