Periodontitis Remedies

Is the only remedy for gum disease caused by a decade-old crown to get it replaced? I might have been scammed a decade ago when I was told by a dentist I needed multiple crowns when I was only 20 years old. I take good care of my teeth now yet have bleeding and painful gums at the crown's locations. I have been trying multiple remedies for gum disease, yet nothing seems to help at those locations.