To get the evidences for decreasing the discomfort, dissatisfaction, and for improving management of the implant prothesis through assessment implant patients` awareness and discomforts about care of the prostheses. The subjects were 300 implant patients who treated in the 20 dental clinics in Pusan, Ulsan and Daegu. The general characteristics, recognition, maintenance, discomfort and dissatisfaction, and oral hygiene status were collected. Level of the discomfort and dissatisfaction was measured by a 5 Likert scale, and analyzed by the equivalent of 100. The life-span of the implants was overestimated, however, periodic recall check and scaling were underwent. The level of discomfort and dissatisfaction was generally good, but many of them (65.3%) complained the food impaction. As a result of the multiple regression analysis, level of the discomfort and dissatisfaction increased in case of more number of the prosthesis (β=0.864), however decreased in case of more frequent teeth brushing (β=0.737), more frequent periodic check (β=-0.737), longer duration from the implantation (β=-0.090). It is very important for the implant patients to be recognized that the lack of care may shorten the life-span of the implant prosthesis. Therefore, efforts of the continuous oral hygiene care such as, periodic recall check, scaling, teeth brushing, the correct using of additional oral hygiene product, and education would be more emphasized.