All you need is your smartphone to pick up free Crest and Oral-B in stores at CVS this week. Select Crest toothpaste and Oral-B toothbrushes are part of a promotion: receive $3 ExtraBucks when you buy two. There’s a limit of two on this promotion. Clip a $5/3 digital Crest coupon and a $1/1 digital Oral-B coupon to save at the register. After all of the savings have been combined, you’ll pay nothing for three Crest toothpaste tubes and one Oral-B toothbrush.