9 months ago I went to the dentist to get a root canal. At this time i was instructed to start taking better care of my teeth. with that said since then i have been brushing after every meal, flossing twice a day and using a flouride treatment(ACT) however, my teeth are starting to decay faster than normal. My last dental visit a month ago I had no cavities on my left side however I looked today and number 17 has a black spot on it as well as bad decay on the OD area. my gums are swollen and sore. and the teeth where I just got my rooth canal the gums are swollen around the crown and my mouth is just sore. What is this. I'm do everything i can to save my teeth. What more can i do? please help me!!