I regret that I haven't been on the electric toothbrush beat over the last few years. Philips' latest offering, the Next-Generation DiamondClean 9900 Prestige, uses AI to identify which parts of your mouth you've covered, and where you've missed a couple of teeth. The brush features a display on the handle that shows a 12-segments mouth map as you brush. Philips' current top-of-the-line toothbrush comes in at $US430, while Oral-B isn't far behind at $400 (currently discounted to $351 on Amazon). If you don't want to wait – and don't mind using an app to review your mouth map – this brush we reviewed from Oclean covers all the bases for a lot less money.