Periodontitis is a serious gum infection that damages the soft tissue and bone supporting your teeth. It begins with plaque buildup, which hardens into tartar and triggers inflammation. If untreated, it causes gums to recede, pockets to form, and teeth to loosen or fall out. Symptoms include bleeding gums, bad breath, gum recession, and painful chewing. It can progress silently and is a leading cause of tooth loss in adults. Periodontitis is preventable with proper oral hygiene, regular dental cleanings, and early intervention. Treatment may involve deep cleaning, medication, or surgery to restore gum health and preserve the teeth.