Kissing is one of the ways to express love between lovers, if there is a bad smell in the mouth, the charming atmosphere will be instantly lost. But in reality, the taste of saliva may be because of the “love” overwhelmed and can not smell, but halitosis, a disease, more love, should not be able to resist, can not get down the mouth. Is the power of love, really so magical, will not let people smell breath? Before we explore this issue, let’s talk about how bad breath came about. According to statistics, about 10%-65% of people worldwide have suffered from bad breath, while the incidence of bad breath in China is 27.5%, that is, on average, 4 people, there is a bad breath. There are various causes of bad breath, 85% of bad breath comes from the oral cavity, from excessive proliferation of oral bacteria (inadequate cleaning) or oral diseases (tooth decay, calculus, etc.). In addition, the respiratory tract (tonsillitis, rhinitis, pneumonia, etc.), digestive tract (gastroesophageal reflux, H. pylori infection, etc.), and blood (kidney disease, diabetes, dieting and weight loss, etc.) are all sources of bad odor. The smell of rotten eggs, rotten leaves, rot, acidity, bad cheese, urine …… These persistent and annoying odors will not only push your lover further and further away, but are also signs of disease, so it is better to go to the hospital as soon as possible for a clear examination. Excluding the bad breath caused by disease, and then healthy people, the taste of saliva is actually smelly, do not believe you lick your arm after a while and then smell. Hey, the head! Then why this saliva smell when kissing will not smell it? There are a large number of microorganisms in the mouth, although the saliva itself does not smell, but the anaerobic bacteria in the saliva in contact with the air, will ferment to produce a variety of odors. In addition, if not cleaned properly, food residues provide a good living environment for bacteria to multiply and double the taste. Bad breath in the morning is a perfect example. And this smell, when kissing can not smell the reason may have four points: 1, kissing tightly: some love couples kissed too tight, not at all to the bacteria contact air opportunities, the smell does not emit, the nose naturally can not smell; 2, clean in place thoroughly: if your partner in a kiss with you before, do a full set of oral cleaning, you also can not smell the odor, after all, saliva is originally “clean and dry” (but do not use mouthwash for a long time, will destroy the normal balance of oral flora, have bad breath hurry to the hospital!) 3, adrenaline surge: kissing is a “physical work”, kissing to heartbeat accelerated shortness of breath, kissing to adrenaline surge, kissing to a slight lack of oxygen, when the perception will become weaker, the taste of saliva naturally can not smell; 4, happy dopamine: hot lovers, there will always be some dopamine secretion on the head of the moment, and even addicted to each other’s body odor. The other party’s body odor addiction, a small taste of saliva is naturally not enough to fear, this is the “power of love”, but the hot period is not accurate. For you and your loved ones, oral cleaning can not be lazy, healthy habits, cleaning ineffective long-term bad breath to seek medical attention. The Role of Oral Microbiota in Intra-Oral Halitosis[J].Journal of Clinical Medicine,2020,9(8) :2484. :2484. [2]Conteduca V,Sansonno D,Lauletta G,et al.H.pylori infection and gastric cancer:state of zhe art[J].Int J Oncol,2013,42(1):5-18. [3]Li Yan,Zhang Yanyu, Zhang, et al. Bad breath and other oral odors[J]. Chinese Journal of Pharmacy, 2021(10):64-66. [4] Ma L, Wang S Y, et al. Etiology and treatment progress of halitosis of oral origin[J]. Journal of the Armed Police Logistics College: medical edition,2017(12):1088-1092.