The causes of bad breath are multifactorial and no 1 fruit has been found to be a better treatment for bad breath. Most bad breath is caused by bacterial infection of the tissues in the oral cavity. For example, bacteria infect the hard tissues of the teeth causing dental caries, or bacteria infect the periodontal tissues causing periodontitis. A large proportion of these bacteria are anaerobic bacteria, and among the anaerobic bacteria are gas-producing podococci, which themselves can decompose substances in the oral cavity and produce sulfur-containing gas, and the sulfur-containing gas will have a distinct odor, which is the direct cause of bad breath. From this point of view, no 1 fruit has the ability to simply kill this bacteria, even if the application of antibiotics, the effect of killing the bacteria is not ideal, mainly to inhibit the bacterial effect. For these diseases, the best treatment for bad breath is to go to a professional stomatologist to remove the primary lesion. For example, for the caries caused by the oral cavity, should apply the oral turbine drill to remove and repair the decayed parts. For periodontal disease, supragingival scaling and subgingival scaling should be performed to remove the periodontal calculus and plaque. This is the way to cure bad breath in the mouth.