In interproximal reduction, to gain space in the maxilla and mandible, the use of mechanically oscillating systems, and in particular diamond-coated abrasive strips, such as Oscident Strips (Oscident, Bad Homburg vor der Höhe, Germany) or the Ortho-Strips system (Intensiv, Montagnola, Switzerland), has proven clinically successful. By modifying the working area of the oscillating diamond strips in the Ortho-Strips system and leaving a non-diamond grain–coated zone of 0.5 mm at the upper and lower margins, unwanted abrasion and cervical step formation can be prevented, thus significantly increasing safety when using this system. Keywords: enamel reduction, interproximal reduction, oscillating strips, stripping