Internal Bleaching

What Is Internal Bleaching?

Internal bleaching, also known as the walking bleach technique, is a dental procedure used to lighten a tooth that has become discolored from the inside following root canal treatment. When a tooth undergoes root canal therapy, blood breakdown products and remnants of pulp tissue can seep into the surrounding dentin, causing the tooth to darken over time. Internal bleaching addresses this discoloration by placing a bleaching agent directly inside the tooth’s pulp chamber.

This procedure is a conservative and effective alternative to covering the tooth with a veneer or crown, preserving the natural tooth structure while restoring a color that matches the surrounding teeth.

Who Needs Internal Bleaching?

Internal bleaching is recommended for patients who have:

  • A single tooth that has darkened after root canal treatment
  • Discoloration caused by trauma to the tooth, even if the tooth is still vital but has darkened due to internal bleeding
  • A desire to avoid more invasive cosmetic solutions such as veneers or crowns
  • An otherwise healthy root canal-treated tooth with an intact root and adequate remaining tooth structure

The procedure is only performed on teeth that have had successful root canal treatment with no signs of infection or reinfection. At Serenity International Dental Clinic, your dentist will evaluate the tooth with X-rays to confirm it is a suitable candidate.

The Internal Bleaching Process

Assessment and Preparation

Your dentist takes X-rays to verify the health of the root canal treatment and surrounding bone. The existing filling on the back of the tooth is partially removed to access the pulp chamber.

Barrier Placement

A protective barrier, typically made of glass ionomer cement, is placed over the root canal filling material at the gum line level inside the tooth. This barrier prevents the bleaching agent from reaching the root and surrounding tissues.

Bleaching Agent Application

A sodium perborate paste (mixed with water or a low-concentration hydrogen peroxide solution) is placed inside the pulp chamber. The access opening is then sealed with a temporary filling, allowing the bleaching agent to work over several days.

Follow-Up Visits

The patient returns in one to two weeks for evaluation. If the desired shade has not been achieved, the old bleaching agent is removed and fresh material is placed. This cycle may be repeated two to four times until the tooth matches the surrounding teeth.

Final Restoration

Once the target shade is reached, the bleaching material is removed, the chamber is cleaned, and the tooth is sealed with a permanent tooth-colored composite filling.

Benefits of Internal Bleaching

  • Conservative approach: Preserves natural tooth structure without the need for a crown or veneer.
  • Effective results: Successfully lightens most internally discolored teeth to match adjacent teeth.
  • Minimally invasive: Utilizes the existing access cavity from the root canal treatment.
  • Painless: The tooth has no nerve, so the procedure causes no discomfort.
  • Affordable: Significantly less expensive than a porcelain crown or veneer.
  • Natural appearance: Restores the tooth’s color from within, producing a natural-looking result.

Aftercare

  • Avoid biting on hard foods with the tooth while the temporary filling is in place.
  • Attend all follow-up appointments so your dentist can monitor the bleaching progress and check for any complications.
  • Maintain good oral hygiene with regular brushing and flossing.
  • The results of internal bleaching can last several years. If slight discoloration returns over time, the procedure can be repeated.

Why Choose Serenity International Dental Clinic

Serenity International Dental Clinic in Hanoi, Vietnam, offers internal bleaching as part of our comprehensive cosmetic and restorative dentistry services. Our dentists have extensive experience with this technique and take care to protect the tooth’s root and surrounding tissues during every step of the procedure. Located at 16 Chau Long, Ba Dinh, Hanoi, we provide personalized treatment plans and attentive follow-up care for patients from Vietnam and abroad.

Frequently Asked Questions

How long does internal bleaching take?

The entire process typically requires two to four visits spaced one to two weeks apart. Each appointment is brief, usually lasting 20 to 30 minutes. The total treatment time depends on the severity of the discoloration.

Is internal bleaching safe for the tooth?

Yes. When performed correctly with a proper protective barrier over the root canal filling, internal bleaching is considered safe. Your dentist monitors the process at each visit to prevent over-bleaching or complications.

How long do the results last?

Internal bleaching results typically last several years. Some patients may notice gradual re-darkening over time, in which case the procedure can be safely repeated.

Can internal bleaching be done on any discolored tooth?

Internal bleaching is specifically designed for teeth that have darkened after root canal treatment or internal trauma. It is not effective for external staining or discoloration caused by medications such as tetracycline. Your dentist will assess whether internal bleaching is the right solution for your specific case.

Does the procedure hurt?

No. Because the tooth has already undergone root canal treatment and no longer has a living nerve, internal bleaching is a painless procedure. No anesthesia is required.