Darby Frost Endo Refrigerant Spray is used in endodontic treatment for testing of the pulp vitality. It is an environmentally safe cold stimulus that is non-flammable and does not require refrigeration. Simply spray on a cotton pellet and touch the pellet to the facial surface of the tooth. Observe patient's response and evaluate. Features and Benefits Fast and Easy to Use No Refrigeration Needed Mint Scent