Periodontal disease is a progressive deterioration of the tissues that support the teeth. It starts in the gums and spreads to the roots of the teeth. Plaque build-up causes acid erosion, weakening the teeth and leading to tooth loss. Gum disease is a precursor to periodontitis. It forms pockets under the gums where harmful bacteria can thrive and enter the bloodstream, causing infections in other parts of the body. Severe cases can lead to destruction of the jawbone and tooth loss. Prevention through good oral hygiene is essential.