Tongue-ties (strips of material passed through the horse's mouth over the tongue and tied under the jaw) have been used for generations on racehorses worldwide as a method for the rider to retain control if his horse is prone to manoeuvering it's tongue over the bit. The use and efficacy of tongue-ties has spawned much debate and the Equine Veterinary Journal published reports in 2009 and 2013 evaluating use on racing performance and airway stability in thoroughbred racehorses.