Abstract: A method for measuring arch wires. A guide wire is provided, having at one end an exposed length of wire and a stop. The exposed length of wire may be inserted into a buccal tube, up to the stop. At least a portion of the guide wire may then be inserted into brackets, at least to a point proximate a midpoint of the patient's teeth. The midpoint may be marked on the guide wire, for example by clamping. The guide wire may then be removed, and compared to an arch wire. The arch wire may then be cut to length, outside of the patient's mouth, and thereafter installed in the conventional manner.