A woman died during a routine tooth extraction in Moscow, the Investigative Committee announced Thursday.
An ambulance was called to the scene, but the woman, who was at a private clinic in southwest Moscow, was pronounced dead by the time it arrived.
The Investigative Committee has launched a probe into the circumstances surrounding the death.
The woman, who was in her mid-60s, began to feel unwell after the dentist injected her with an anesthetic, news agency Interfax reported.
One theory suggests she may have reacted negatively to the anesthetic, the Ren-TV news site reported.
Last June, a 17-year-old boy suffered a fatal allergic reaction to an anesthetic at a dentist's office in Saratov. The teen went into anaphylactic shock following an injection. In November, the clinic was cleared of any responsibility for his death, the Region64 news site reported.
