Halitosis is referred to discharge of volatile sulfur compounds such as smell gas when breathing,which is mainly caused by the oral microflora imbalance with the number of physiological flora reduced while the species and numbers of bacteria producing smell increased. Bad breath is a manifestation of topical oral or systemic adverse metabolic conditions. Clinically,diseases can be diagnosed according to mouth odor and bad breath be treated through the adjustment of oral microecological environment. Based on the analysis of the relationship between bad breath and micro-ecology,as well as bad br...
