Walmart offers the Oral-B Professional Healthy Clean + ProWhite Precision 4000 Electric Toothbrush, model no. 6905585689, for $55. This $15 mail-in rebate cuts it to $40. With free shipping, that's $10 under our mention from last week and the lowest total price we've seen since May, when we saw it for this price bundled with a $50 Restaurant.com gift card. (It's a current low by $8.) It features an ergonomic handle, FlossAction technology, four cleaning modes, and a pressure indicator to warn when brushing too hard. Deal ends December 4; rebate expires December 31.