My dentist scared me and said I had a mild case of gingivitis and that the only way to prevent it is by flossing every day. She said that any sign of bleeding gums is gingivitis in the making. That freaked me out enough to force me to do it a lot more often. I only forgot to floss twice since my appointment 2 weeks ago.
I even saw Youtube videos of periodontal disease (which is what happens when gingivitis gets worse) and wow, that was a huge wake up call!