In 2021, according to figures from the French National Health Insurance, 72% of the amount of fraud detected will be committed by health professionals. Elise Lucet and her team investigated dental centres. Some of these groups seem to have become cash machines billing for useless or fictitious procedures. Repentant dentists testify. Former patients tell of being mutilated. Liberal nurses seem to be the health professionals who commit the most fraud. Some of them artificially inflate the bills of insured persons, especially the oldest and most vulnerable patients. Does the social security system manage to recover the money from fraud? With the introduction of third-party payment, the Assurance Maladie must now reimburse health professionals within a very short time. Even if it means carrying out few controls.