Synonyms for Corrective (same or very similar meaning)
WordNet sense 1 (a device for treating injury or disease):
restorativeWordNet sense 2 (designed to promote discipline):
disciplinary, disciplinalWordNet sense 3 (characterized by strictness, severity, or restraint):
strict, nonindulgentWordNet sense 4 (changing for the better):
betteringFrom the ODE community, based on WordNetadd/edit