My teeth have become worse and worse - even room temperature water in winter was too cold for me. I switched to Sensodyne. I use 3-4 times a day and at night I don't rinse thoroughly so I leave a coating on them. It took a little time for the level of discomfort to decrease, and if I stop using it, the pain comes back immediately. I use straws for v. cold drinks in summer, and I avoid going from hot to cold in a short period of time. I also let cold food out on the side to "warm up", like salads and raw veggies. I can have everything I used to have again now, just more carefully. Hope this helps.