The Oral-B iO Series 9 uses oscillating-rotating technology with micro-vibrations, a 2-minute timer with 6 brushing modes, and a pressure sensor, priced around $280. The Philips Sonicare DiamondClean 9000 employs sonic vibration at 31,000 strokes per minute, offers 4 modes plus 3 intensities, a smart pressure sensor, and costs about $250, with many users preferring its gentler feel on gums.
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