The brand of mouthwash for treating and preventing periodontal disease is Listerine.
The mouthwash Listerine contains some great active ingredients that are very effective at killing the bacteria above the gum line as well as reducing sticky plaque film and early gum disease.
Listerine is the best mouthwash for keeping your mouth and gums as well as teeth healthy.
I would recommend using the Listerine twice per day as in in the morning and at night to keep the bacteria killed in your mouth.
You can also gargle with Apple Cider Vinegar as it will too kill bacteria and prevent gum disease and treat periodontal disease as well.
I would also recommend seeing a doctor and possibly getting a professional teeth and gum cleaning which can also do much more than the Listerine.