These electrical devices pump water out in a slim steady or pulsating stream. Although they do not seem to remove plaque that is attached to the tooth well, they are very effective at flushing out food and bacteria byproducts in periodontal pockets or that get caught in orthodontic appliances.
They are particularly useful for delivering medication to hard-to-reach areas. For example, prescription antibacterial rinses can be sprayed into gum pockets with an oral irrigator. Irrigators should be used in addition to brushing and flossing, not as an alternative.
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