A heartbreaking incident has shocked California after a 9-year-old girl, Silvanna Moreno, died following a dental surgery under anesthesia. According to an autopsy report, Silvanna’s death was caused by methemoglobinemia, a rare blood disorder that prevents red blood cells from delivering oxygen effectively throughout the body.
Also Read
Mediheal Hospital Submits 382 Kidney Transplant Files to DCI Amid Organ Trafficking Probe
The condition reportedly developed after Silvanna was administered nitrous oxide, one of the anesthetic gases used during the dental procedure.
Silvanna had been suffering from persistent tooth pain since October 2024. After months of discomfort, her family decided to have the affected tooth surgically removed at Dreamtime Dentistry in Vista, California, in March 2025. Although she had a mild fever before the operation, she took Tylenol and appeared well enough for the surgery to proceed.
The operation lasted nearly three hours. Afterward, Silvanna woke up and was moved to a recovery room before being discharged in what staff described as a stable condition.
Dr. Ryan Watkins, the dentist who performed the procedure, said her vital signs remained normal and that there were no indications of complications during or immediately after the surgery. He added that Silvanna’s medical history had been reviewed carefully, and that she was under continuous monitoring throughout the process.
However, tragedy struck later that day. While on her way home, Silvanna reportedly fell asleep and began snoring heavily. Once home, she was laid on her bed and continued sleeping. Her grandmother later noticed that her breathing had become shallow and irregular. Moments later, Silvanna was found unresponsive.
Emergency responders performed CPR and rushed her to Rady Children’s Hospital, where doctors pronounced her dead shortly after arrival.
Following the autopsy, the San Diego County Medical Examiner’s Office confirmed methemoglobinemia as the cause of death, linking it directly to the nitrous oxide anesthesia used during the dental procedure. The case has raised serious questions about pediatric anesthesia safety and the need for strict monitoring protocols in dental clinics.
Dr. Watkins expressed deep condolences to Silvanna’s family, saying he is devastated by the incident. Dreamtime Dentistry has since launched an internal investigation into its anesthesia procedures and pledged to enhance safety protocols to prevent similar tragedies.
Silvanna’s family is now calling for greater accountability and clearer regulations for anesthesia use in children’s dental surgeries. The community continues to mourn the loss of the young girl whose bright future was cut short by a rare medical complication.
