The invention discloses a gum positioning cutter, which is composed of a shell and a pressing piece. The bottom end of the shell extends downward with a positioning column and a knife seam, and the lower edge of the pressing piece is embedded with a blade, and the top end is provided with a pressing head； the pressing piece can be placed inside the shell, and an elastic element is arranged between the pressing head and the bearing edge of the shell. When the pressing piece is pressed and moved downward, the blade protrudes downward for a predetermined stroke from the knife seam, and the pressing piece can also be reset by the function of the elastic element u3002本創作揭露一種牙齦定位切割器，其係包含外殼及按壓片所構成。該外殼底端向下延伸有定位柱及刀縫，而按壓片的下端緣嵌設有刀片，頂端設有按壓頭；可將按壓片置入外殼內部，按壓頭與外殼的承置邊之間再設置彈性元件，當按壓片受壓而下移時，該刀片即由刀縫向下凸伸一預定行程，而按壓片亦可藉彈性元件之作用而復位。
