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I gotchu fam, I’ve had 4 or 5 different ones.
Oral B Pro Expert, should be £10-£15. Uses AA batteries, which is desireable because when non-replaceable batteries fail on more expensive options, they’re non-replaceable. You can get rechargeable AAs anyway. I used one for several years until the motor gave out; the rest lasted 18 months at the most.
Pressure sensitivity is a useless gimmick: check with your dentist, mine recommends just enough pressure to touch the bristles to the tooth surface, let the tool do the work. Timers and varying speeds are also useless unless you’re prone to massively over brushing.
My dentist has said I should get an electric toothbrush. There seems to be a big variation in prices for them, what's worth going for?