HORRIBLE!! Absolutely horrible! I used this for a week or 2 and couldn't figure out why my teeth and gums were hurting so badly. It got to the point that I couldn't brush my teeth without my gums bleeding and almost crying. I was about to make a dental appointment when I remembered I recently switched toothpastes, so I switched back and after a couple days my mouth was feeling so much better! Will NEVER buy another Crest product in my life!