Dental surgery comprises operations on teeth or to remove teeth and is distinct from maxillofacial surgery which involves surgery to the mouth as a whole and often includes major bone and soft tissue surgery. It is vital to liaise with the dental surgeon before embarking on anaesthesia. Unlike all other branches of anaesthesia, in dental surgery the anaesthetist is involved in the surgery itself, and is not merely giving the anaesthetic and monitoring the patient remotely. In practice, much dental anaesthesia is for operations on children and therefore experience in paediatric anaesthetic techniques is also needed. Operations for dental conservation tend to take longer than extractions and involve the use of the drill, which sprays water into the mouth, and a sucker to aspirate the water. For extractions of one or two teeth, the extraction takes place during recovery from induction.