A former Houston dentist was formally charged Monday with failing to properly treat a sedated 4-year-old patient who was left with permanent brain damage in what should have been a routine procedure.Bethaniel Jefferson, 40, who lost her license to practice in Texas in November, was indicted by a Harris County grand jury on a felony charge of causing serious bodily injury to a child by omission, according to the district attorney's office.The child's mother, Courissa Clark, said she was "overjoyed" when she heard the news."We're really grateful that justice has been served and the person that did this to our baby is finally being brought to justice," Hall told the Chronicle.Her lawyer said the young mother now balances work with caring for her disabled daughter, Nevaeh Hall."When little Nevaeh was taken to the dentist that day, (her parents) turned her over to the dentist trusting that the dentist would protect and look after their little girl," said attorney James Moriarty. "But she overdosed her on sedatives."The girl was sedated at the Diamond Dental office about 8:30 a.m. Jan. 7, 2016, prosecutors said in a statement. Three hours later she suffered a seizure, and her oxygen level and temperature fell dramatically. Prosecutors say it took more than four hours before anyone called for medical assistance.The girl's mother told the Houston Chronicle last year that her Nevaeh was a healthy and rambunctious girl until the January incident resulted in brain damage that left her unable to walk, talk or respond to instructions.Jefferson could not be reached for comment, and court records did not list an attorney who could speak on her behalf.Jefferson was reprimanded by the Texas Board of Dental Examiners in 2005 and 2012, prosecutors said. The board revoked her license in November after a state administrative judge ruled that she "fell below the minimum standard of care, failed to uphold the duty of fair dealing and committed dishonorable conduct when providing dental care."The Chronicle's investigation cast a spotlight on Medicaid dental clinics that had flourished through treatment of pediatric patients whose low-income families qualified for government assistance.Medicaid dental claims in Texas quintupled between 2005 and 2015 to $1 billion a year after the state doubled reimbursement rates in 2007.The reimbursement system rewards dentists who perform multiple procedures, leading to allegations that clinics rush children through serious treatments to claim more government money.The U.S. Department of Health and Human Services reported last year that it had 160 ongoing investigations into Medicaid dental fraud in Texas, far more than any other state.Jefferson now faces trial on a first-degree felony charge."This indictment should send a message to the medical community that they will be held accountable for abandoning their patients in times of crisis," prosecutor Stan Clark of the Texas attorney general's Medicare fraud unit said in the statement."While accidents in the health care industry occur more than everyone would prefer, practitioners must react appropriately and contact higher level medical care providers when they realize their patient is distressed beyond their capabilities," he said.