This is the appearance of a tooth with gingival recession. The recession of the gingiva leaves more enamel, and even dentin, exposed. Gingival recession, seen with aging and with periondontitis and gingivitis, may even expose the dentin below the enamel. The cementum and the periodontal ligament are located much lower down in the tooth socket in the bone of the jaw. Decay that is initiated by gum recession can eventually reach the pulp.