Periodontitis is a gum disease caused by infections around the teeth, gums, and periodontal ligament. Left untreated, it can worsen from gingivitis to periodontitis. Symptoms include inflamed, bleeding, and swollen gums. The document recommends seeing a periodontist, who specializes in diagnosing and treating periodontal diseases. A periodontist can properly diagnose the severity of the disease and develop a customized treatment plan. When searching for a periodontist in Delhi, it is best to research qualifications and reviews to find a specialist suited to one's needs and budget. Regular dental checkups are important for preventing and treating oral health problems.