In Grief, Mom Shares Heartbreak of Heroin By LIBBY CUDMORE ONEONTA The downward spiral started with a trip to the dentist. “My son Jeremy had his wisdom teeth removed and the dentist prescribed him painkillers,” said his mother, Deb France of Oneonta. “Our world was turned upside down.” He first went to jail for theft at 18, and the family’s insurance wouldn’t cover his treatment. He tried to commit suicide, and he was committed to the psychiatric ward. “They said,…