teeth need to be replaced for several reasons. to prevent surrounding teeth from tipping to prevent opposing teeth from extruding for protecting the integrity of your occlusion or bite. it also helps to keep the missing tooth as a one-tooth-problem. if you feel that you do not want an implant there are other options such as bridges and removable dentures. there is also the aesthetic reason if the missing tooth is visible. and you also want to preserve the chewing efficiency of your mouth.
after tooth extraction do you have to replace with an implant?