Some individuals are more prone to tooth decay than others. With a highly refined carbohydrate diet or inadequate home care, tooth decay may occur on areas of the tooth or root not covered by a dental crown. If the decay is discovered at an early stage, it can often be filled without remaking the crown or fixed bridge. Long delays in treatment, a loose provisional or permanent crowns and bridges can result in additional decay, the "death" of a tooth nerve, which would require a root canal or even the loss of a tooth and/or teeth.