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Teeth Whitening

Internal Tooth Bleaching

Bring a dark tooth back to life

Dentist comparing a woman's teeth to a shade guide for teeth whitening in a dental clinic.

Internal Tooth Bleaching

The answer for darkened, root-canal-treated teeth

One tooth darker than the rest? Often the culprit is an old root canal treatment, a past injury or internal staining that surface whitening simply can’t reach. Internal bleaching fixes it — from the inside. A small amount of bleaching agent is sealed inside the tooth, working over days or weeks to restore it to match your surrounding teeth. Less invasive than a veneer. More effective than surface whitening. Just targeted, precise colour correction.

Dentist wearing a face mask and gloves using a dental microscope while treating a patient lying back in a dental chair.
Two dentists in blue gowns and masks performing dental treatment on a patient lying down under an overhead light.
Healthcare worker wearing a Tom and Jerry print scrub top, face mask, and face shield reading a document.

At Clarendons, internal bleaching is a specialist skill delivered with care and precision. Calm, comfortable appointments in our Leeds city centre clinic. Transparent pricing. And results that let you smile without that one dark tooth pulling focus.

Dentist wearing a face mask and gloves using a dental microscope while treating a patient lying back in a dental chair.

What is internal tooth bleaching?

Whitening from the inside out

  • Internal (or non-vital) bleaching is a technique used to whiten a single tooth that has darkened from the inside — usually after root canal treatment, internal bleeding from trauma, or long-standing stains trapped within the tooth. A small access hole is made in the back of the tooth (often reopening the root canal access), the canal is sealed, and a bleaching agent is placed inside the pulp chamber.

  • The tooth is then sealed with a temporary filling. Over the following days or weeks, the bleach lightens the tooth from within — a technique sometimes called the “walking bleach”. Once the desired shade is reached, the bleach is removed and a permanent filling placed.

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Dentist wearing a mask and blue gloves examining a patient's mouth with dental tools in a clinic.

Features and benefits

Precision whitening where it’s needed

  • Targets single darkened teeth

    External whitening doesn’t reach internal staining. Internal bleaching goes directly to the source — brightening one tooth to match its neighbours.

  • Less invasive than veneers

    Before resorting to a veneer or crown, internal bleaching can often restore colour without any significant tooth preparation. Preserves natural tooth structure.

  • Surprisingly effective

    Most internally-stained teeth respond brilliantly — often back to matching shade within 1–3 sessions. Gentle, incremental, controlled.

The highlights

  • Modern office reception area with marble front desk, dark grey armchair, wooden panel walls, chandeliers, and a painting of oranges on the wall.
  • Modern dental clinic room showing dental chair, equipment with various dental tools, and bright window lighting.
  • Three small succulent plants in decorative pots arranged on a white bathroom sink near a chrome faucet.
  • Modern seating area with three gray chairs around a black round coffee table in front of a large window with wooden blinds, and a potted plant on the side.
  • Modern dental chair with attached overhead light, dental tools, and monitor in a clean clinic room.
  • Close-up of a white Global brand medical or dental microscope mounted on an adjustable arm against a light gray wall with electrical outlets.

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Dentist wearing a face mask and gloves using a dental microscope while treating a patient lying back in a dental chair.

The Clarendon's Difference

Conservative treatment for discoloured teeth

  • Too many patients with a single dark tooth are straight-up sold a veneer — an irreversible treatment that requires enamel removal. At Clarendons, we always assess whether internal bleaching might solve the problem first. It’s cheaper, less invasive, and often gets you a result you’re delighted with. Only if bleaching isn’t the right solution do we discuss veneers or crowns.

  • Our award-winning clinic in Leeds city centre handles internal bleaching with the expertise it deserves. Proper assessment of the tooth’s root canal status, precise technique, close monitoring, and follow-up restorations that protect the treated tooth long-term. Delivered in a calm, spa-like environment with clear pricing and flexible payment options.

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THE BRAND PATIENTS TRUST

Rated 5-stars from 3,840+ Google reviews

“My front tooth is now the same colour as my other teeth and looks so much better! I wouldn’t go anywhere else for dental treatment after this experience”

Melissa Wootton

“Sent in photographs of a heavily discoloured front tooth and scheduled an appointment straight away. The treatment was a success, the service was fantastic and the quality was great!”

Joanna Sawczyn

“I now feel I have amazing teeth and they are white! Thank you so much for looking after me so well and supplying such a high quality service”

Andrea Farmery

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Modern office reception area with marble front desk, dark grey armchair, wooden panel walls, chandeliers, and a painting of oranges on the wall.
Dentist wearing a face mask and gloves using a dental microscope while treating a patient lying back in a dental chair.

How much does internal bleaching cost?

A precise fix. Clear pricing.

Internal bleaching is priced per tooth, usually including initial consultation, the procedure itself, one or two review appointments and a final permanent restoration. Cases needing additional root canal work (retreatment or new treatment) are quoted separately. We’ll provide a clear breakdown at your consultation. Flexible payment plans available.

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Pricing & Plans

FAQs

Still have questions about internal tooth bleaching?

How long do the results last?

Internal bleaching results are usually long-lasting — often many years or permanently — because we’ve addressed the internal cause of the darkening. If any regression occurs, a repeat internal bleach is straightforward. Combining with external whitening can enhance and extend the result.

Will the dark tooth definitely match the others?

In most cases, yes — though results vary slightly depending on the cause and depth of the discolouration. For severe staining, we might get close but not perfect. If internal bleaching alone doesn’t achieve the match, we can discuss further options like composite bonding or a veneer to fine-tune the result. We’ll set realistic expectations at consultation.

Is internal bleaching safe for the tooth?

Yes, when done correctly. The bleach is sealed inside the pulp chamber but kept away from the root canal itself (with a protective barrier). There’s a small risk of internal resorption (tooth damage) in rare cases, which is why we carefully monitor the treatment and space out applications. It’s far less invasive than veneering or crowning the tooth.

How long does internal bleaching take to work?

Most patients see their tooth noticeably lighter within 3–7 days of the first application. Full results typically require 1–3 applications over 1–4 weeks. We’ll review progress and adjust the treatment until you’re happy with the colour match to your other teeth.

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Explore more

Your smile transformation starts here. Explore what makes Clarendons different — from the team behind the work to the journeys that inspire it.