Internal Bleaching in London

Internal bleaching is a procedure that whitens the teeth which have had root canal treatment or which became necrotic following trauma.

Treatment Duration

90 minutes


From £650

Team Experience

25+ Years

Recovery Time


Google Rating

★★★★★ (4.9)

Written by: Dr Raul Costa

Clinically reviewed by: Prof Dr Christian Mehl

Table of Contents
    Home » Treatments » Internal Bleaching

    Internal tooth bleaching consists of the insertion of an oxidizing chemical substance into the tooth’s pulp. Before the actual bleaching agent is inserted, the area is cleaned and the canals are sealed.

    The internal bleaching gel has the same effect as the external bleaching products, but it acts from the inside of the tooth. The procedure can be performed as a self-standing procedure or correlated with external whitening procedures.

    Why do teeth discolour?

    In most cases, the cause of discolouration in non-vital teeth is the presence of broken-down parts of the tooth’s nerve. The main tooth nerve is surrounded by thousands of small dentine canals. When a tooth nerve dies – resulting in a non-vital tooth – small blood particles from the former tooth nerve accumulate in these canals, which can lead to discolouration of the tooth from the inside which compromises your smile. Even following root canal therapy around 10 per cent of patients are unhappy with the appearance of their root-filled tooth.

    What are the options to cover a dark tooth?

    There are several options to treat discoloured teeth:

    • Crowns
    • Ceramic veneers
    • Composite (tooth-coloured) white fillings
    • Remove the tooth and replace it with a dental implant, denture or bridge
    • Use internal whitening alone using hydrogen peroxide or in combination with in-office chair side teeth whitening or home whitening to brighten the teeth

    When using implantsdentures or bridges the discoloured tooth will be removed permanently. Veneers, partial crowns or full crowns can be used to enhance your smile, and change the shape and texture of the teeth. However, all these options require removal of tooth tissue via a dental drill to prepare the tooth for the addition of a veneer, partial or full crown. An alternative can be to use dentist-led whitening procedures to improve your smile. In cases of root canal-treated teeth internal bleaching (or non-vital bleaching) can be used.

    Teeth whitening or bleaching is one of the most common cosmetic dentistry treatments performed by a dentist or dental hygienist. Still, sometimes it might be difficult to get a good result with internal bleaching. Below you will find a detailed step-by-step description of how internal whitening is conducted successfully.

    How much does internal tooth whitening cost?

    The treatment usually involves 3 sessions with a total cost at £650.

    Meet your award-winning Internal Bleaching dentist and team…

    • We have over 75+ years of combined dentistry experience across our specialist team.
    • 10,000+ treatments performed and counting.
    • We are leaders in the dental industry – we regularly teach, lecture and publish our research work internationally.

    All-on-4,  Apicectomy,  Bleaching,  Bone Grafting,  Bridges,  Bruxism,  Ceramic Braces,  CM Team,  Corrective Braces,  Crowns,  Dentures,  Fillings,  Gum Correction,  Gum Disease,  Immediate Implants,  Implants,  Internal Bleaching,  Invisalign,  Lingual Braces,  Low Friction Braces,  Maryland Bridges,  Navigated Implants,  Oral Surgery,  Partial Inlays & Crowns,  Prosthodontics,  Retainers,  SS Team,  Treatment of Peri-Implantitis,  Veneers,  Zygomatic Implants

    Mr Ajay Talpada

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    Internal Bleaching costs

    Single inlay

    From £1,500

    Multiple inlays

    From £1,200

    Single onlay

    Partial crown
    From £1,600

    Multiple onlays

    Partial crowns
    From £1,200

    Our Expertise

    Having healthy, white teeth is an important factor for smiling with confidence. Discoloured teeth can affect your smile greatly. Whether internal whitening, in-office or home whitening or a combination of them – the dentists and dental hygienists in our clinic in London have a combined experience of several thousand whitenings performed to get you a first-class result.

    Along with in-office bleaching/tooth whitening, the internal tooth whitening procedure is one of the simplest ways to enhance your smile, it’s an easy and effective dental treatment with excellent results. But it must be done following the correct protocol. The whitening treatment is completely painless and the whitened teeth can provide very desirable results for patients and dentists alike.

    Our commitment to quality, patient comfort, and advanced dental practices makes us the preferred choice for those seeking the best in oral health care.

    Our clinic is conveniently located in the heart of Marylebone, Central London and is accessible by car, taxi, bus, Tube and on foot.

    Internal Bleaching Before & Afters

    Internal Bleaching reviews

    Find out more about our patients, their treatment and why they chose Wimpole Street Dental Clinic.

    Lin Qi​

    The combination of these expertly administered treatments left me not just with a visibly brighter and healthier smile, but also with a deeper understanding of how to care for my teeth. Thank you so much Wimpole Street Dental Clinic!

    What is needed to start a successful internal whitening?

    A sufficient root canal treatment without any sign of an inflammation

    Good oral hygiene and healthy surrounding gums

    A sufficient restoration in place or planned to be done in due course

    Classifying the tooth with a good long-term prognosis

    If the previous root canal treatment is not sufficient, the tooth must be treated again by an endodontist (a specialist for root canal treatments). If the gums are inflamed increasing personal dental care and a professional dental hygiene session can provide a solution. The diagnosis – if you are suitable – will be determined during an initial consultation with a special focus on the endodontic situation.

    How does internal teeth whitening work?

    If the initial consultation established that the above conditions are met, or if all the endodontic and periodontal treatments have been successfully performed, parts of the root filling material that seal the canals is removed. Then the top part of the root canal treatment is sealed with an adhesive composite filling. The remaining cavity is filled with hydrogen peroxide or carbamide peroxide (the actual internal bleaching agent). The cavity is then sealed.

    What happens next?

    A week later you will have to come back to our dental surgery and we check the bleaching result. Very often the treated tooth could still be dark and we will have to repeat the bleaching process. In our experience in most cases, a total of three bleaching appointments is needed. Once the desired colour has been achieved we neutralise the bleaching reaction and the tooth is sealed with a composite filling or a dental restoration, e.g. a partial crown or a veneer. This finish depends on the loss of tooth material and the risk of the treated tooth cracking. The result achieved will remain the same for many years.

    Step-by-step procedure of the internal bleaching treatment

    – Initial consultation with a dentist, radiographs and charting of the gums
    – Deciding upon which treatment is suitable (in surgery teeth whitening/bleaching, internal bleaching, crowns, veneers, fillings, etc.)
    – If needed, re-treatment of the root canal treatment and dental hygiene
    – Photography, shade taking and smile analysis
    – If needed, take impressions and construct a whitening tray
    – Removal of the top part of the root canal material
    – Sealing the top part of the root canal with an adhesive filling
    – Placing the whitening agent (hydrogen peroxide or carbamide peroxide) inside the tooth
    – Seal the tooth with a temporary composite filling
    – Wait one week and re-examine the discolouration
    – Repeat the bleach technique until the whitening result is satisfactory
    – End bleaching procedure by filling the tooth cavity with a tight filling

    Are there any risks for this procedure?

    Bleaching, tooth whitening or internal tooth bleaching are among the safest procedures in dentistry. However, like in any other medical treatment, there are some risks involved. For internal tooth bleaching of non-vital teeth, the gel used to whiten the teeth (mostly hydrogen peroxide) can extremely rarely lead to bone resorption, resorption of tooth material or gum inflammation. To prevent the gel from leaking a tight seal of the root canal treatment with an adhesive filling is imperative. Furthermore, it is important that minimal tooth substance is sacrificed by the dentist in order to achieve a white result too quickly.

    Wimpole St Dental Clinic has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. We avoid using tertiary references. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

    • Frank AC, Kanzow P, Rödig T, Wiegand A. Comparison of the Bleaching Efficacy of Different Agents Used for Internal Bleaching: A Systematic Review and Meta-Analysis. J Endod. 2022 Feb;48(2):171-178. doi: 10.1016/j.joen.2021.10.011. Epub 2021 Nov 9. PMID: 34762968.
    • Heboyan A, Avetisyan A, Karobari MI, Marya A, Khurshid Z, Rokaya D, Zafar MS, Fernandes GVO. Tooth root resorption: A review. Sci Prog. 2022 Jul-Sep;105(3):368504221109217. doi: 10.1177/00368504221109217. PMID: 35759366.
    • Arshad M, Vaziri N, Habibzadeh S. Effect of Internal, Office, and Home Bleaching on Shear Bond Strength of Enamel to Porcelain Laminate Veneers. Int J Prosthodont. 2023 May-June;36(3):323-330. doi: 10.11607/ijp.7773. PMID: 36484656.
    • Fernandez-Riera Y, Gutmann JL. Historical Reflections on the Use of Internal Bleaching to Manage Discolored Teeth. J Hist Dent. 2022 Summer/Fall;70(2):119-127. PMID: 35767301.
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