A method of forming a dental tool or instrument having a memorized shape, the method comprising: selecting a nitinol wire having an initial transition temperature of 10±5 degrees Celsius; grinding the nitinol wire at room temperature to form the dental tool or instrument so as to have a shank, located adjacent a first end, and a working area, with at least one cutting surface, located adjacent an opposite second leading end, the nitinol wire is in its austenite phase during the grinding; molding the working area into a molded shape having at least one protrusion formed in a mold by applying a pressure of less than 0.7 MPa to the working area which is only sufficient to induce the working area of the dental tool or instrument to follow a contour of the at least one protrusion of the mold and without causing any permanent deformation of the dental tool or instrument; and heating the dental tool or instrument accommodated in the mold at a temperature of between 200 and 375 degrees Celsius for a duration of time of between 30 minutes and 240 minutes to: a) alter the initial transition temperature of the dental tool or instrument to a final transition temperature of 32.5 ± 3 degrees Celsius; and at the same time, b) memorize the molded shape including the at least one protrusion so that the dental tool or instrument will automatically return to the molded shape having the at least one protrusion as soon as the dental tool or instrument is at a temperature at or above the final transition temperature. selecting a nitinol wire having an initial transition temperature of 10±5 degrees Celsius; grinding the nitinol wire at room temperature to form the dental tool or instrument so as to have a shank, located adjacent a first end, and a working area, with at least one cutting surface, located adjacent an opposite second leading end, the nitinol wire is in its austenite phase during the grinding; molding the working area into a molded shape having at least one protrusion formed in a mold by applying a pressure of less than 0.7 MPa to the working area which is only sufficient to induce the working area of the dental tool or instrument to follow a contour of the at least one protrusion of the mold and without causing any permanent deformation of the dental tool or instrument; and heating the dental tool or instrument accommodated in the mold at a temperature of between 200 and 375 degrees Celsius for a duration of time of between 30 minutes and 240 minutes to: a) alter the initial transition temperature of the dental tool or instrument to a final transition temperature of 32.5 ± 3 degrees Celsius; and at the same time, b) memorize the molded shape including the at least one protrusion so that the dental tool or instrument will automatically return to the molded shape having the at least one protrusion as soon as the dental tool or instrument is at a temperature at or above the final transition temperature. a) alter the initial transition temperature of the dental tool or instrument to a final transition temperature of 32.5 ± 3 degrees Celsius; and at the same time, b) memorize the molded shape including the at least one protrusion so that the dental tool or instrument will automatically return to the molded shape having the at least one protrusion as soon as the dental tool or instrument is at a temperature at or above the final transition temperature.