Generally, for a tip rhinoplasty, you don't have to wear a splint, however your surgeon may elect to do so to control the edema and swelling and help shape the tip and the supratip break. If there is a reason you don't want to wear the splint (i.e. going back to work) you should discuss the need for splinting with your doctor.
Hope that helps.
Christopher C. Chang, MD
Washington DC, Maryland and Virginia