In one of your videos on Youtube, from a few months back, you mentioned that there was a study being done on taking the xylitol at night before bed. I started doing this as the final step before bed, after doing the complete mouth care system you developed. I can report great results with this addition. My teeth are getting healthier, whiter and the gums are improving at a seemingly faster pace. I had been doing the system for about 5 months before I added in the xylitol as the final step at night. My husband has also started using the system and his tartar is almost completely gone.