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As a cardiac surgeon, the speaker avoids mouthwash for two reasons: it kills healthy bacteria in the mouth, injuring the oral environment, and this bacteria is involved in a chemical reaction that helps control blood pressure. Destroying this bacteria can cause high blood pressure, a risk factor for strokes and heart attacks.
Instead of mouthwash, the speaker recommends limiting mouth breathing, flossing or using a water pick twice a day, and brushing or scraping the tongue at least twice a day. The speaker used mouthwash for years until being educated about its potential drawbacks. Using mouthwash is a personal choice, and people should inform themselves, understand the data, and make good decisions.