Micromotion and fretting damages at the dental implant/bone interface are neglected for the limitation of check methods, but it is particularly important for the initial success of osseointegration and the life time of dental implant. This review article describes the scientific documentation of micromotion and fretting damages on the dental implant/bone interface. The fretting amplitude is less than 30 mm in vitro and the damage in the interface is acceptable. While in vivo, the micromotion’s effect is the combination of damage in tissue level and the real biological reaction. Micromotion and fretting damages at the dental implant / bone interface are neglected for the limitation of check methods, but it is particularly important for the initial success of osseointegration and the life time of dental implant. This review article describes the the scientific documentation of micromotion and fretting damages on the dental implant / bone interface. The fretting amplitude is less than 30 mm in vitro and the damage in the interface is acceptable. While in vivo, the micromotion’s effect is the combination of damage in tissue level and the real biological reaction.