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. Parole chiave: enamel reduction, interproximal reduction, oscillating strips, stripping