Normative warm and cold thresholds were assessed at the trigeminal region in 44 healthy volunteers, 24 females and 20 males, aged from 24 to 41 years, using a thermostimulator based on heat flux, which indicates the movement of heat energy. The heat flux thresholds are useful for measuring thermal thresholds of the trigeminal region, characterized by observation of minute thermal changes. Women showed high sensitivity to small tem-perature changes, as reflected by their warm and cold perception threshold. No differences were found in thermal sensitivity between the infra orbital and mental regions of the skin. Sensitivity to cooling was significantly greater than the sensitivity to warming at two branches of the trigeminal nerve.
