Unfortunately, the bacteria that cause tooth decay can work themselves under the gum line and cause damage that ordinary brushing and a professional hygienist's cleaning cannot remove. In this case, periodontal therapy may be required. This involves folding back the gum and deep cleaning the pockets of decay from the tooth. Several visits may be necessary depending on how extensive and deep the decay extends below the gum line. Dr. Schneider can examine and test your teeth, and advise you about the need and extent of any indicated periodontal work.