Changing or revoking an advance health directive
Your wishes as stated in a directive are not final. You can change them at any time provided you still have the decision-making capacity to do so. You should review your directive every two years or if your health changes significantly.
If you do want to make changes to your directive, you should destroy the current one along with any copies and make a new one.
You may also revoke your directive at any time. This must be done in writing. No specific form is required and the person witnessing your signature does not need to be a justice of the peace, commissioner for declarations or a lawyer.