How do you reverse the effects of gingivitis?

I've had swollen gums since before I can remember! I've tried brushing regularly, maybe I'm not brushing right, I've tried flossing every day, all of this and nothing changed. My dentist just says to brush more, I ask him how, and he doesn't even show me. I now can't afford to go see a dentist because of the economy, so I'm stuck looking for answers anywhere I can find them. Please help.