As years pass, I discover more and more that my teeth are precious commodities, requiring investments of both time and money. Not everyone can hold onto them for life. Eating foods that foster decay and neglecting proper oral hygeine are sure to leave a tooth or two — or more — behind. Just as threatening are bad genes, injuries and, frankly, aging. Needless to say that even diligence in flossing, brushing, check-ups and cleanings does not guarantee the retention of every tooth. Fortunately, dentistry, as both art and science, has advanced to the point where even tooth loss is correctable.