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Gargling is the act in which one bubbles a liquid in one's mouth. It usually requires that the head be tilted back, allowing a mouthful of liquid to sit in the upper throat. The head can be tilted by extending either the neck or the back, depending on what is comfortable for the gargler. Vibration caused by the muscles in the throat and back of the mouth cause the liquid to bubble and undulate throughout the throat and mouth region.
There are numerous studies that show that gargling water a few times a day will lower the chance of upper respiratory infections such as colds.