I have used this since it was introduced, and has been very good. The last two tubes I have used the peppermint has been overly strong. It feels like I have a stong burning feeling in my mouth. Two things could be happening, the flavor has been overly increased, or my mouth has become extra sensitive. I now have to fimd another toothpaste to meet my needs, crast or another brand. I do not want to change, because as I said, I have been using Crest sine it was put on the market.