The most common option to treat a cavity is to use a composite resin filling. This method is preferred by many because the coloring of the filling can be matched to the natural shade of tooth color, making them (if at all) much less visible than amalgams. They provide significant strength to the restoration, though less than an amalgam, so they are best used on small to mid sized cavities that will endure moderate chewing pressure. Also there is less drilling required for this type of filling, so more of the natural tooth can be preserved.