“…A thorough assessment requires selection of validated measurement tools, which are adjusted to perceptual abilities and allow the detection of pain and assessment of its intensity, as well as the efficiency of treatment. 17 , 19 , 96 Preferred scales, recognized by clinicians as the most precise evaluation tools, are based on self-assessment. 16 , 97 The scales most commonly used in the postoperative period include the verbal rating scale (VRS), NRS, VAS, and picture scales, eg, based on the representation of facial expressions ( Figure 2 ).…”