A routine dental appointment was supposed to bring relief.
Instead, it ended in heartbreak.
Nine-year-old Silvanna Moreno had been dealing with persistent tooth pain for months when her family brought her to Dreamtime Dentistry in Vista, near San Diego, for treatment. What was expected to be a dental procedure involving sedation and multiple treatments soon became a tragedy that left her family devastated and a community searching for answers.
Silvanna underwent an extended dental procedure on March 18. According to reports, the treatment included a root canal on a molar, the placement of a crown, and the extraction of several decayed teeth, including both baby and permanent teeth.
For her family, the goal was simple.
They wanted her pain to stop.
But just hours after leaving the clinic, Silvanna was rushed to the hospital.
She never recovered.
Concerns Before the Procedure
In the days before the appointment, Silvanna had reportedly been experiencing dental discomfort. Her mother later said the child had also developed a fever at one point, which was treated with children’s medication.
That detail has become an important part of the investigation.
Dreamtime Dentistry has stated that pre-operative paperwork completed before the procedure indicated Silvanna was not sick at the time of treatment. The clinic also said that if staff had been informed of an active illness or recent fever, the procedure would have been postponed until she was medically stable.
Pre-operative screening is especially important when sedation is involved.
In pediatric dentistry, medical history, recent illness, medications, and overall condition are all factors that can affect how a child responds to anesthesia or sedative medications. These checks are meant to reduce risk and help providers determine whether a procedure should move forward or be delayed.
The Dental Treatment
On the day of the appointment, Silvanna was treated by Dr. Ryan Watkins, who served as both the dentist and anesthesia provider during the procedure.
According to statements from the clinic, sedation was administered before the dental work began, and the procedure itself was completed without any reported complications at the time.
The clinic later said Silvanna was monitored throughout the treatment and during recovery. It also stated that she was discharged awake, stable, and with vital signs reportedly within normal range.
Dreamtime Dentistry has maintained that standard post-anesthesia protocols were followed before Silvanna left the facility with her mother.
But what happened after she returned home would become the focus of deep concern.
A Frightening Change at Home
After leaving the dental office, Silvanna went home with her family.
Reports indicate she appeared very drowsy, which can happen after sedation. She slept for an extended period following the procedure.
At first, her family believed she was simply recovering.
Then her condition began to change.
Relatives reportedly noticed that her breathing became slower and less regular. Her grandmother checked on her more than once as concern grew.
Eventually, Silvanna became unresponsive.
Her family called emergency services.
Paramedics arrived and rushed her to Rady Children’s Hospital in San Diego.
Emergency Efforts at the Hospital
When Silvanna arrived at the hospital, medical staff found that she was in cardiac arrest. Reports described the condition as asystole, meaning the heart had stopped producing electrical activity and was no longer effectively pumping blood.
Doctors and emergency personnel immediately began life-saving efforts.
Despite their attempts to revive her, Silvanna did not recover.
She was later pronounced dead.
What had begun as a dental visit had ended with the loss of a child.
Medical Examiner’s Findings
Following Silvanna’s death, a medical examination was conducted to determine what had happened.
The medical examiner ruled the cause of death as methemoglobinemia in the context of recent nitrous oxide administration.
Methemoglobinemia is a rare but serious condition in which the blood’s ability to carry oxygen is reduced. When oxygen delivery is impaired, the body’s organs can quickly become endangered.
The condition can occur in uncommon circumstances involving exposure to certain medications, chemicals, or anesthetic agents.
Reports have also indicated that multiple sedative or anesthetic medications may have been used during the procedure. In sedation dentistry, medication combinations must be carefully selected and monitored, particularly when children are involved.
The Clinic’s Response
Dreamtime Dentistry has said Silvanna showed no immediate signs of distress while she was under the clinic’s care.
According to statements provided to media outlets, her oxygen levels remained within normal range during the procedure and recovery period.
Dr. Watkins also stated that no signs of methemoglobinemia were observed during or after the dental work. He said that if warning signs had appeared, emergency protocols would have been activated immediately, including transfer to a hospital.
The clinic has said it is conducting an internal review to examine what happened and determine whether all protocols were properly followed.
Previous Scrutiny
The case has also brought renewed attention to Dr. Watkins’ professional history.
Reports noted that he had previously been reviewed by the California Dental Board in connection with a separate case involving a serious medical emergency during treatment in 2016.
That earlier matter involved anesthesia administration and later led to a lawsuit that was reportedly settled. Following the regulatory review, disciplinary measures were taken, including a period of professional probation from 2020 to 2023.
Those prior events have become part of the broader public discussion as investigators, regulators, and the community examine the circumstances surrounding Silvanna’s death.
A Family and Community Searching for Answers
Silvanna Moreno’s death has been classified as accidental, but the investigation is ongoing.
Authorities and medical professionals continue to review the sequence of events, including her condition before the procedure, the medications used, monitoring during treatment, discharge procedures, and what happened after she returned home.
For her family, the questions are deeply personal.
They brought Silvanna in hoping to treat her dental pain.
Hours later, they were facing an unimaginable loss.
The tragedy has shaken the San Diego-area community and raised broader concerns about pediatric sedation, dental safety, pre-operative screening, and emergency response procedures.
No investigation can undo what happened.
But for Silvanna’s family, answers matter.
They matter because a child’s life was lost.
They matter because parents trust medical and dental professionals with their children’s safety.
And they matter because every case like this forces difficult but necessary questions about how future tragedies might be prevented.
Silvanna’s appointment was supposed to be routine.
Her family expected her to come home, rest, recover, and eventually feel better.
Instead, they are left grieving a little girl whose life ended far too soon—and waiting for a clearer understanding of how a day meant for healing turned into heartbreak.
