Halitosis and and lack of vitamin B6 have a certain relationship, in addition to dental caries, gingivitis, periodontitis, Helicobacter pylori infection can also cause bad breath. 1. lack of vitamin B6: vitamin B6 deficiency can cause bad breath, the body lacks vitamins and trace elements, easy to cause bad breath. Eat more fresh fruits and vegetables in normal times to supplement the appropriate vitamins, drink milk, bone broth, fish soup, etc. to supplement the trace elements. 2. Dental caries: caries when food residues remain in the cavity, can not be cleaned out in a timely manner, resulting in bacterial growth can cause bad breath. When caries occurs, fill the teeth in time to prevent further deepening of caries. 3. Gingivitis, periodontitis: gingivitis, periodontitis when dental calculus and plaque accumulate in the gums, resulting in inflammation of the gums cause bad breath. If you have gingivitis, you can clean your teeth in time to reduce the inflammation of the gums, and the bad breath will disappear. 4. Helicobacter pylori infection: When the stomach is infected with Helicobacter pylori, bad breath will also occur. Do carbon 14 breath test or blood draw to determine the content of Helicobacter pylori, and then symptomatic treatment, bad breath will gradually disappear. When bad breath occurs, go to the hospital in time to get a clear cause and treatment to avoid delaying the condition.