The image provides a results of internal bleaching on a discolored tooth. The procedure has significantly lightened the previously darkened tooth, matching it more closely with the surrounding teeth.

Key Points about Internal Bleaching:

1. Indications:
   - Ideal for teeth that have undergone root canal treatment.
   - Effective for intrinsic discoloration (stains that originate from within the tooth).

2. Procedure Steps:
   - **Access and Cleaning:** The dentist makes an opening in the tooth to clean and prepare the pulp chamber.
   - **Application of Bleaching Agent:** A bleaching agent is placed inside the tooth.
   - **Sealing:** The tooth is temporarily sealed, and the bleaching agent is left in place for a specific period.
   - **Evaluation and Re-treatment:** The tooth is assessed, and the process may be repeated until the desired shade is achieved.
   - **Final Sealing:** Once the bleaching is complete, the tooth is permanently sealed.

3. Benefits:
   - Targets deep, internal stains effectively.
   - Preserves more natural tooth structure compared to other cosmetic treatments.

4. Considerations:
   - May require multiple treatments.
   - Results can vary based on the extent of discoloration and the individual's response to treatment.
   - Post-treatment care includes avoiding staining foods and maintaining good oral hygiene.

This before-and-after comparison illustrates the potential of internal bleaching to restore the natural appearance of discolored teeth, enhancing the overall aesthetics of the smile.