In the late 19th and early 20th centuries, the collision of sterile technique, anaesthesia and radiology made routine surgery on the wisdom teeth possible. John Tomes's 1873 text A System of Dental Surgery describes techniques for removal of "third molars, or dentes sapientiæ" including descriptions of inferior alveolar nerve injury, jaw fracture and pupil dilation after opium is placed in the socket.[34] Other texts from about this time speculate on their deevolution, that they are prone to decay and discussion on whether or not they lead to crowding of the other teeth.[35]