Generally speaking, vitamin 2 cannot treat bad breath. 1. Vitamin B2 is used for the prevention and treatment of vitamin B2 deficiencies, such as lingual inflammation, xerostomia, dry and cracked lips, scrotal inflammation, conjunctivitis, seborrheic dermatitis and so on, and generally can not treat bad breath. 2. Halitosis should go to the regular hospital for examination to clarify what causes halitosis. Due to the different causes, the treatment methods are different, and the drugs used are also different. For example, if gingivitis or periodontitis caused by periodontitis, need to carry out periodontal treatment; if bad breath is gastritis, gastric ulcer and other gastric diseases can be taken gastric acid inhibitors, gastric mucosa protector. If the long-term bad breath should be timely consultation, by the doctor to clarify the cause of the disease, give targeted treatment, do not blindly self-medication; at the same time, it is recommended that every morning and evening to adhere to brushing, gargling after meals, to maintain oral cleanliness.