The Oral B Io Series 9 is the better choice for those seeking advanced oral care features, including AI-powered brushing and a water flosser. However, the Oral B Io Series 7 is a more affordable option with effective plaque removal and long battery life. According to a study by the Journal of Clinical Dentistry, the Oral B Io Series 9 removed 99.7% of plaque, while the Oral B Io Series 7 remove...
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