• Teeth which seem at an acceptable shade, which is subjective for clinician and patient to decide.
  • Presence of composite restorations mixed with natural tooth structure, which will not lighten with treatment. They may need replacing post whitening. If the restorative needs of the patient are too high, whitening may not be a good idea.
  • Porcelain restorations such as crowns and veneers will not lighten, and may require replacement after whitening treatment. Patients need to be made aware of the process and costs for doing this prior to teeth whitening, to ensure they consent to this.
  • Pregnant or lactating women.
  • Patients who are unable to be compliant.
  • Patients with unrealistic expectations.
  • Patients with exposed cementum and exposed root surfaces, as cementum does not lighten with teeth whitening agents.