 The Hilotherm face mask will be placed immediately after the surgery, while the patient is in the recovery area and will be worn on ONE side of the face, this being randomised using a computer programme and decided at the time of surgery. It will be worn for one hour after wisdom tooth removal. We will then use 3D photography analysis of the patients face to assess the extent of swelling, their assessment of pain using a visual analogue scale, and their overall satisfaction with Hilotherm therapy. These measurements will be recorded at: 