coolj... happy to say that I have been AC free now for almost a year. As I posted in my earlier thread the thing that did it for me was changing to BASIC cavity-fighting toothpaste. NO whitening, NO tartar control, NO pro-health, NO baking soda, NO funky flavoring, etc etc. Basic, basic anti-cavity ONLY. Clearly that was what was giving me all the problems and happy to say ZERO angular chelitis since my post above.