<<Disclaimer: Verify this information before applying it to your situation.>> I finally figured out that the Sensodyne toothpaste my dentist had asked me to use was causing a mild reaction. So, I called Proctor & Gamble today (1-800-492-7378) and spoke to Nancy in consumer relations. She checked and said that Crest for sensitive teeth was GF. I had already switched to regular Crest, which the CSA list says is okay, but am now going to try the sensitivity formula. Hope this helps anyone else out there whose teeth react to hot, cold, or pressure. Judy in California.