Intravenous is an alternate route of sedation that helps apprehensive kids calm down through the dental procedure. In this the child is not put to sleep completely as in general anesthesia for dental procedures but is an state of Lull, with loss of awareness about whats happeneing around. An alternative when laughing gas and other behavious management techniques fail, but if the quantum of work is a lot then treating the child under General Anesthesia is the best Bet