I’ve almost finished a tube. So far, so good. You only have to use about a pea sized amount each time. So far my teeth feel far less sensitive, cleaner and the colour seems to be coming back into the translucent areas. I have a few white spots that have improved slightly but nothing major yet. One thing I have to keep reminding myself is that I have to swirl the toothpaste foam for 30 seconds after brushing before spitting out, and then avoid rinsing with water. I admit I forget sometimes even after almost 3 months of using it. The foam makes my mouth dry after about 10 minutes and I’m hoping future formulations don’t have this problem, because I can’t leave it on any longer without rinsing. Maybe less foaming agent? Otherwise, thumbs up!