The best thing you can do to prevent periodontal disease is keep your mouth spotlessly clean at all times. That would mean flossing, brushing, rinsing, using a Waterpik or any instrument that would enable you to keep your mouth free of bacteria.
What people cannot do is smoke excessively, or smoke at all or drink excessively. These are other causes of periodontal disease or that contribute to the advancement of periodontal disease.
Just in a nutshell, by keeping your mouth really, really, clean and enjoying good oral habits you’ll live a very prosperous life with no periodontal disease.