Unfortunately animals with tooth problem rarely ever recover or survive. It's important to handle your pet so it cannot fall on its face, and most importantly to constantly feed a proper diet. Breeding can also be a factor. There are still many treatable illnesses that can be detected by regularly weighing your pet, about once a week. When chinchillas stop eating, that in itself causes severe digestive complications and quickly turn a treatable illness into a fatal one.
Also check daily food and water consumption.