Gangnam Low-Cost Dental Clinic Deaths During Sedation Anesthesia

1. Overview

Between December 2025 and August 2026, two patients died during implant surgery at a large low-cost dental clinic in Gangnam, Seoul. Subsequent disclosures by insiders raised allegations of medical negligence and a cover-up. The clinic promoted its low prices while performing an excessive number of procedures—placing dozens of implants in a single day. This was followed by a series of fatal incidents attributed to excessive anesthesia and inadequate emergency response.

2. Incident and timeline

The events began in December 2025, when a woman in her 70s died after being given an excessive dose of anesthetic while undergoing a procedure to have 11 implants placed in one day. At the time, members of the dental community voiced concern about overtreatment driven by price competition and inadequate safety management. The clinic, however, continued advertising its low prices despite these warnings.

In February 2026, the Korean Association of Oral and Maxillofacial Surgeons and the Korean Dental Society of Anesthesiology held a joint press conference warning about the dangers of “conscious sedation” and calling for safety systems to be overhauled. Kim Seung-o, president of the Korean Dental Society of Anesthesiology, stressed that dental sedation is a medical procedure directly linked to patients’ lives and underscored the need for real-time monitoring and emergency response capabilities. Despite these warnings from the academic community, a second tragedy occurred just months later. On August 3, 2026, a man in his 60s, identified as Mr. A, had traveled from outside the Seoul area after seeing the clinic’s low-cost advertisements. He died of cardiac arrest during implant surgery at the same clinic. He reportedly had 17 teeth extracted and eight implants placed in a single day during his first operation, and died while his sixth implant was being placed on the day of the incident.

3. Insider disclosures and cover-up allegations

Immediately after the second death, disclosures by clinic insiders were reported by major outlets including JTBC and MBN, expanding the case beyond simple medical negligence to include allegations of a cover-up. Former employees testified that the clinic used the term “sleep anesthesia” to reassure patients, while nurses or other non-specialists performed actual medical procedures, in serious violation of safety standards.

In particular, internal footage exclusively reported by MBN showed a patient being given anesthetic while their wrists were restrained, shocking viewers. This directly violated the principle of “conscious sedation,” under which patients must maintain spontaneous breathing. It also ran counter to the standards upheld by the Korean Dental Association’s Medical Advertising Review Committee, which has prohibited the term “sleep” and required the use of “conscious sedation.” JTBC also reported allegations that, after the first death, the clinic internally downplayed or concealed the incident by claiming that “there was no accident,” suggesting an organized attempt to cover it up.

4. Authenticity debate

4.1. The inevitability of overtreatment under a low-cost business model

The prevailing analysis is that the incident was not a mere accident but an inevitable result of the low-cost business model. The Korean Dental Association’s Medical Advertising Review Committee and Park Sang-eun, legal affairs director of the Seoul Dental Association, identified high-volume, low-margin procedures and commercial promotion of “sleep implants” as the underlying causes. The argument is that maintaining low prices requires increasing patient turnover, inevitably leading to dozens of procedures per day and excessive anesthesia. The fact that both deaths occurred while more than 10 implants were being placed in a single day lends weight to claims that price competition came at the expense of patient safety.

4.2. Medical qualifications and inadequate emergency response

Others, however, argue that the central issue is not negligence by individual medical staff but the lack of safety management at the system level. A representative of the Korean Dental Society of Anesthesiology criticized the clinic for ignoring the society’s longstanding emphasis on emergency preparedness and conservative medication use. In particular, allegations that nurses administered sleep anesthesia, along with the circumstances surrounding anesthetic being administered after patients’ wrists were restrained, appear to constitute clear violations of the legally permitted scope of practice and ethical standards. This has lent credibility to the interpretation that the incident was not an individual mistake but organizational negligence involving the deliberate removal of safety measures under a low-cost business model.

5. Trivia

The term “sleep implants,” used by the clinic, has been officially prohibited by the Korean Dental Association’s Medical Advertising Review Committee on the grounds that it could lead patients to overlook the risks. Low-cost dental clinics nevertheless marketed the procedure as if it were safe “sleep,” making this a typical case of false and misleading advertising that ultimately led to two deaths.