Abstract: A dental floss and a method of using and making the dental floss. The dental floss is configured to mark a dental crown wherein the dental floss comprises a fiber substrate and a coating uniformly disposed around the fiber substrate. The dental floss further comprises a dye impregnated on at least one portion of the coating, wherein the dye adheres to a surface area of the dental crown when the fiber substrate contacts the surface area. The method of marking a dental crown with dental floss comprises placing a dental crown over a prepared tooth and inserting a fiber substrate between the dental crown and an adjacent tooth. Next, the method comprises moving the fiber substrate against a surface area of the dental crown and against the adjacent tooth in order to dispose a dye from the fiber substrate to the surface area of the crown wherein the dye marks the surface area.