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Nasal irrigation or nasal lavage is the personal hygiene practice in which the nasal cavity is washed to flush out excess mucus and debris while moistening the mucus membranes of the nose and sinuses. It has been practised in India for centuries as one of the disciplines of yoga. Clinical testing has shown that this is safe and beneficial with no significant side effects.
The technique may be as simple as snorting water from cupped hands but more elaborate methods use a pot, squeeze bottle or syringe to pour or squirt the water into a nostril. The water then either runs out of the other nostril or goes through the sinuses to the back of the throat from where it may be spat out.
Warm salt water is commonly used with a buffering agent such as sodium bicarbonate. Sometimes xylitol is added to help kill bacteria that has accumulated in the nose. Hypertonic solutions which are more salty than the nasal fluids are favoured and one study indicated that salt from the Dead Sea was especially efficacious
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