I've had fewer and fewer dental problems as I've grown older. I believe this is because of two things: an electric toothbrush, and mouthwash. I never used mouthwash prior to the past 5 or 6 years, and I've been using an electric toothbrush for 3 years. I haven't had a cavity or any issues for about 7 years I think. I also never brush right after eating. I chew gum and/or rise with water.
