What is the best natural treatment for periodontal gum disease?

Unfortunately... there is no natural treatment for periodontal disease. If untreated, it can destroy your gums and the bones that support your teeth, and eventually force you to have teeth extracted.
NONE Don't loose. Brush your teeth several times in a day , don't loose your teeth see your dentist now .
Periodontist. You'll need to see a periodontist to treat your gum disease. There are no natural remedies to eradicate this condition.
Periodontal Disease. Infection. Requires treatment by a Dentist, preferably a Periodontist with 10+ years of post-high school education. If there was an effective "natural" treatment, OTC product, snake oil, ointment, herb, vitamin, that worked, it would have already put Periodontists out of business. Before your infection worsens, seek qualified professional care.