If you have a crack in your tooth that has extended into the pulp, the tooth can be treated with a root canal. Some time after the root canal, a crown can be placed to protect the crack from spreading.
Common educational path's for CSI's include a degree in criminal justice or a specific degree in crime scene investigation. If you are already working and do not have the time to go to classes, there are CSI degree programs that you can earn online. Degree & Education Requirements for Crime Scene Investigators.
Landing a job as a crime scene investigator takes training, practice, and experience. As law enforcement specialty positions, candidates will usually need to work the streets as a patrol officer for a year or more before they can be considered for transfer to a special detail or job.