Abstract: Dental implants are commonly used in situations for replacement of natural teeth. Despite many advances, techniques, and implant-design, implant failure is a significantconcern for the patient and dentist. The dental implants are designed that best suits the various types of bone. Different etiology for the implant failure and their contributing factors has been discussed in this review article. The purpose of this concise review is to discuss the etiology of implant failure by highlighting the various classification put forth by different authors.