I recommend First Dental Clinic in Unjeong-dong, Paju.

I discovered First Dental because it's located in the same building as my child's academy. It's also right next to Jangkali Obstetrics and Gynecology, which I previously mentioned here. While it's not particularly large, the interior is as clean and beautiful as you can see in the photos. Everyone is incredibly friendly. The dentist, a young man, was very attentive and explained everything with ease. He also did a painless scaling. I highly recommend it.