Tooth is very smelly, there may be symptoms of tooth decay, there may also be the possibility of gingival papillitis, food embedding. It is recommended to fill the tooth in time, remove the decaying matter, local rinse, and put iodine glycerin or minocycline hydrochloride on the gingival papillae to restore the shape of the tooth and adjacent relationship, which can prevent the food embedding and gingival papillitis. If the area around the teeth is smelly, check the plaque and calculus, and if there is periodontal disease you can choose scaling or subgingival scraping to remove the calculus and plaque. Also, use a chlorhexidine mouthwash or a concentrated tinidazole mouthwash for an antibacterial effect.