Halitosis may be due to gingivitis, periodontitis or gastrointestinal dysfunction and other disease factors, the need for active treatment of the original disease, halitosis symptoms can be relieved; halitosis may also be caused by eating too much irritating odor food such as leeks, garlic, scallions and other factors, avoid eating these foods can be relieved. If it is gingivitis, periodontitis and other oral diseases caused by bad breath, gingival cleaning treatment for periodontal treatment, removal of calculus and other causes of the disease can be improved. If it is gastrointestinal dysfunction, intestinal flora imbalance and other gastric diseases caused by bad breath symptoms, you can use vitamin B ₁ tablets, compound digestive enzyme capsules, bifidobacteria capsules and other medications to regulate the balance of the gastrointestinal flora, to promote intestinal peristalsis and bowel movement, thereby relieving bad breath. However, the use of drugs should follow the doctor’s advice. In addition, eating too much garlic, scallions, leeks, stinky tofu and other stimulating foods can also cause temporary bad breath; morning and evening not diligent brushing, food residues by the bacterial fermentation will also appear oral odor. Bad breath can be eliminated by avoiding irritating foods and brushing teeth regularly. Bad breath can also be caused by other reasons. If bad breath is not relieved by eliminating food and improving oral hygiene, you should consult a doctor to find out the cause of bad breath and get treatment under the doctor’s guidance.