It was hard to make a reservation. The updates via KakaoTalk kept not coming right away... Still, the nurses did a great job during the first appointment, so I was able to receive treatment without any problems. As my complexion brightened, I became concerned about the color of my teeth, so I wanted to go back to the place where I had treatment before. I made an appointment and proceeded with the procedure, and although there is some sensitivity for about a day, it is bearable. I must have been really tired, I think I slept snoring. You kept talking to me, so I was able to keep my mouth shut... Thank you.. haha Since it is a hospital specializing in jaw surgery, it seemed like they didn't perform many treatments covered by insurance. There were a lot of foreign patients. K-Medical is really the best haha. I will definitely go back next time I need teeth whitening.