Battery life is excellent—lasting about two weeks per charge in our tests—and unlike Oral-B, the 4100 shuts off after the two-minute timer. It’s also designed with BrushSync technology, which tracks how long you’ve been using your brush head and how much pressure you’re applying. A light on the handle and a beep remind you when it’s time for a replacement—a thoughtful touch.
Unlike the Oral-B brush’s standard black and white, the Sonicare 4100 also comes in pink, azure blue, and dark forest green,…
