Abstract: An elongated flexible dental matrix strip is disclosed. The strip includes a raised portion extending outward from the surface of the strip. The raised portion tapers towards the distal end of the strip in one embodiment and tapers toward both ends of the strip in another embodiment. The raised portion is sized so that when the strip is inserted between adjacent teeth an interference fit occurs. A light force is used to slide the strip into position between adjacent teeth in such a fashion as to anchor the strip in position. The strip serves to contain filling material in a tooth cavity while the filling material or resin hardens. Another embodiment includes a curved surface along one edge of the strip wherein the raised tapered portion is disposed. Yet another embodiment includes two raised tapered portions in parallel with one another.