The elastomeric member of the present invention is a flexible light guide and curing aid, which permits pressure to be applied to a photo curable material during the clinical restoration of a tooth while simultaneously curing the material by exposing the photo curable material to light. The method of the present invention permits the high forces developed between the occlusal surfaces of opposing teeth when engaged to be utilized to create the applied pressure on the photo curable material. The elastomeric member is soft and has an optically transparent body with a first section having first and second opposing planar surfaces adapted for placement in lateral juxtaposition between the occlusal surfaces of opposing teeth of human dentition and a second section extending from the first section adapted to facilitate contact with a dental light guide while the opposing teeth are engaged.