The invention discloses a dental mobile bit structure, which comprises a bit body, a nut and an adjusting ring.The drill body can be connected with the driving end of the dental mobile phone and can rotate at a high speed. The drill body is provided with a threaded section, and the nut is a hexagon nut, which can be screwed and locked on the threaded section of the drill body. The adjusting ring has a predetermined ring width, and a hexagon shaped nut pit is concave in the center, just for the nut to fit in. The center of the adjusting ring is provided with another screw hole, which can be screwed and locked on the aforementioned threaded section.Thus, the drill can control the drilling depth and confirm the drilling position.本創作揭露一種牙科手機鑽頭構造，其包含鑽頭本體、螺帽及調整環所構成。該鑽頭本體可供牙科手機的驅動端連結並令其高速轉動，鑽頭本體上設有螺紋段，該螺帽為一六角螺帽，可旋鎖於鑽頭本體的螺紋段，而調整環具有預定環寬，中央凹設一六角狀之螺帽坑，恰可供螺帽吻合置入，調整環中央又設一螺孔，可旋鎖於前述螺紋段者。藉此，該鑽頭可達到控制鑽頭鑽入深度與確認鑽孔位置之目的。
