About Smile Zone

  • SmileZone Orthodontic clinic
  • SmileZone Orthodontic clinic

Dr. Chang Ok Oh founded Ywonwoo Dental Clinic in 1999 based on his passion for innovation in dentistry and for providing a family-friendly experience. In 2002, Dr. Oh changed the clinic’s name to Smile Again. Under this name, he developed and established the practice of “Surgery First Treatment” and popularized lingual treatment. The clinic also served to train future orthodontists. Dr. Oh’s achievements have garnered recognition both domestically and internationally.




As the fourth industrial revolution arrives, Smile Again is now reborn as Smile Zone with the latest digital equipment and upgraded systems to provide an even higher quality experience.