Badminton, like tennis, is a racket sport that is played by either two players or two teams of two players each. The object is for you or your team to get to 21 points first. You score a point whenever you successfully serve the shuttlecock and your opposing team commits a fault, which means that the team fails to appropriately return the shuttlecock.
Assuming one cares for their teeth by brushing regularly, saliva may smell bad because there are millions of bacteria present in the mouth. Bad smelling saliva or breath can be indicative of a tooth abscess, or a systemic illness such as diabetes.
Bad breath can also be caused by dry mouth (known as xerostomia), which occurs when the flow of saliva decreases. Saliva cleanses the mouth and removes particles that may cause odor. Dry mouth is caused by various medications, salivary gland problems or continuously breathing through the mouth.