If you have lost the crown of root canal treated tooth, then you can get post and core followed by dental crown. Post and core will provide stability to dental crown. If tooth can’t be saved and is unrestorable, then it needs to be pulled out. After tooth extraction, you can get the missing tooth replaced with dental implant or dental bridge. Dentalk implants are best option for missing teeth replacement. If missing tooth is not replaced, then adjacent teeth will start moving toward the missing teeth and the teeth of upper side will supraerupt. Missing tooth if not replaced with lead to misalignment of other teeth and will lead to various periodontal problems. If you can’t afford dental implants or dental bridge, then you can visit a dental school for treatment or can look for free dental clinics near your place. You can also talk to your local dentist if you can pay in installments for dental crown. For more info on replacement of missing teeth, refer to….. http://www.identalhub.com/dental-need-for-replacement-of-missing-teeth-883.aspx