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An orthodontist, named Dr Khalid Kasem, claims kissing for four minutes a day can keep your teeth healthy and prevent bad breath. ”The main benefit of kissing is that it produces more saliva in your mouth. Saliva is important because it helps you chew, taste, swallow, fights germs in your mouth and prevents bad breath — which is definitely ideal when kissing. Saliva also neutralises acids that sit on your teeth, helping to cut your risk of getting tooth decay. The exchange of saliva during a kiss encourages the immune system to create more antibodies, which defends your body from infection.”