Bad breath caused by teeth is orofacial bad breath, which may be caused by tartar buildup or caries, and requires periodontal treatment or filling after decay removal. 1. Periodontal treatment. Accumulation of tartar on the tooth surface, food debris adhesion may cause bad breath, but also cause gingivitis, periodontitis, periodontal abnormal exudate will exacerbate bad breath, general periodontal treatment, remove the calculus on the tooth surface after polishing, halitosis can be significantly reduced. 2. Decay filling. Dental caries, under the action of bacteria, dental tissue corruption, food debris can be embedded in the hole fermentation and produce bad smell, generally need to remove the decay of dental tissue after resin filling can eliminate bad breath, if caries triggered by pulpitis, apical periapical periodontitis also need to carry out root canal treatment before filling. Bad breath caused by teeth is recommended to go to the hospital in a timely manner, so as not to affect the work and life.