Sorry I have been MIA (all due to the holidays). My last adjustment was actually done on Wednesday, December 23. The ortho changed the top power chain to one that "opens" and put a power chain on the bottom teeth. The rubber bands remain the same strength (sea lion). Of course, I have no idea what the terminology means - I just do what the experts tell me to do. Well, by reading my blog so far, you probably realized that I have been very lucky as far as ...