A confident smile is defined by more than the teeth alone. The moment the upper lip lifts fully, the gum tissue framing those teeth becomes just as visible, and for many patients, dark gums or uneven gumline pigmentation is a genuine source of self-consciousness.
Gingival pigmentation: the brown-to-black discolouration of gum tissue caused by melanin is one of the most common aesthetic concerns we see in specialist periodontal practice and, fortunately, one of the more predictably treatable.
The treatment is commonly referred to as gum depigmentation, gum bleaching or gum whitening. Although the terminology varies, the objective is the same: to carefully remove the superficial pigmented epithelial gum tissue and allow fresh, naturally lighter tissue to heal across the treated area.
Gum Depigmentation: What You Need to Know
Treatment time: Usually completed in a single appointment, depending on the extent of pigmentation and whether one or both arches are being treated.
Anaesthetic: Local anaesthetic is used where required to make treatment comfortable.
Stitches: No stitches are normally required.
Healing: Re-epithelialisation is usually well underway within 1–2 weeks, although the appearance continues to mature as the tissues heal.
Cost: From £750 per arch.
What Causes Dark Gums?
Melanin is produced by melanocytes, pigment-producing cells that sit in the basal layer of the gingival epithelium, the deepest layer of the tissue’s surface lining, and the same layer responsible for continuously renewing everything above it.
Melanin itself is not a disease. It is the same natural pigment responsible for skin and hair colour, and its presence in the gums reflects biology, not decay.
What differs from person to person is how much melanin is deposited in that basal layer and how it is distributed. This is what produces the visible brown, grey or occasionally blue-black patches most often seen across the front of the upper and lower gums, exactly where a smile shows them.
Why Do Some People Have Dark Gums?
Gum pigmentation is rarely the result of a single mechanism, and identifying which one is present matters both for choosing the right treatment and for setting realistic expectations about how long the result will last.
The most common cause by far is physiological (genetic) pigmentation, a genetically determined pattern seen more frequently in patients with darker skin phototypes, typically symmetrical, present since childhood, and with no other associated symptoms.
Smoker’s melanosis is another frequent cause, where tobacco by-products stimulate melanocyte activity, and pigmentation tends to correlate with smoking history.
Pigmentation can also be a marker of systemic or endocrine conditions, including Addison’s disease, Peutz-Jeghers syndrome and neurofibromatosis, and it can be drug-induced, associated with antimalarials, minocycline, certain chemotherapy agents and some oral contraceptives.
Localised, isolated patches are sometimes an amalgam tattoo, where particles of old dental restorative material have become embedded in the soft tissue. Historically, heavy metal exposure, including lead, bismuth and mercury, produced a similar picture.
Because the differential is genuinely broad, a careful medical history and a biopsy where anything looks atypical remains an essential first step before any cosmetic treatment is considered.
Pigmented lesions of the gums are, in the overwhelming majority of cases, entirely benign, but ruling out a melanotic naevus, or the exceptionally rare gingival melanoma, always comes first.
How We Treat Dark Gums
Addressing gum pigmentation means removing or disrupting that pigmented basal layer, and the techniques used to do this have changed considerably over the past few decades.
Surgical scalpel gingivectomy was the original approach, reliable but associated with intraoperative bleeding, post-operative discomfort and slower, less predictable healing.
Cryosurgery and electrosurgery followed, offering alternatives to a blade but bringing their own drawbacks: unpredictable depth of tissue destruction with freezing, and a real risk of thermal damage and delayed healing with electrocautery.
Chemical agents, such as phenol and alcohol, were also used, although depth of penetration was difficult to control precisely.
Laser depigmentation has, over the last decade in particular, become a preferred approach for many cases, and for good reason. Compared with a scalpel or diamond bur, a laser can remove the pigmented basal epithelium with considerable precision, less bleeding, and, in many patients’ experience, relatively little post-operative discomfort.
Why We Use a 445nm Laser for Gum Bleaching
Several laser wavelengths have been used for gum depigmentation, including CO₂, Nd:YAG and diode lasers in the 810–980nm range, all working either by ablative vaporisation of the pigmented epithelium or by a gentler, non-ablative photothermal effect on the melanocytes themselves.
In our clinic, we use a 445nm soft-tissue diode laser, a blue-wavelength laser that is very strongly absorbed by melanin and haemoglobin.
That absorption profile is what makes it particularly well suited to this specific procedure: it allows the pigmented basal layer to be removed in a thin, controlled pass, with minimal thermal spread into the connective tissue beneath.
In practice, that translates into a near-bloodless field, precise control over how deep the treatment goes and a controlled approach to the surrounding healthy tissue.
The choice of laser wavelength is therefore not simply about using newer technology. The interaction between the wavelength and the target tissue is an important part of achieving controlled soft-tissue treatment.
What to Expect During Gum Depigmentation
Treatment is planned according to the extent and distribution of the pigmentation.
A specialist assessment is carried out first to establish the likely cause of the pigmentation and to determine whether cosmetic gum depigmentation is appropriate.
Where required, local anaesthetic is used to ensure that treatment is comfortable.
The laser is then used carefully across the pigmented areas, removing the superficial pigmented epithelial layer. The depth and extent of treatment are controlled according to the individual clinical presentation.
One of the advantages of laser gum depigmentation is that stitches are normally not required.
Depending on the extent of pigmentation, treatment may involve one arch or both upper and lower arches.
What Happens After Gum Bleaching?
Recovery from laser depigmentation is typically mild.
Many patients need little to no pain relief and are advised simply to avoid very hot or spicy food for a few days, keep brushing gently and use a chlorhexidine rinse where recommended to support healing.
Re-epithelialisation is usually well underway within one to two weeks, with fresh, pink gum tissue becoming visible beneath the treated area within days.
The appearance will continue to mature as the tissues heal, and the final aesthetic result should therefore not be judged immediately after treatment.
Patients should maintain good oral hygiene while avoiding unnecessary trauma to the healing gum tissue.
Can Dark Gums Come Back?
Patients understandably ask whether the pigmentation will return, and the honest answer depends on the underlying cause.
Physiological pigmentation can recur over a period of months to years, simply because the melanocytes responsible remain genetically active.
This does not necessarily mean that the treatment has failed. It reflects the underlying biology of melanin production.
Repeat treatment, when needed, is generally straightforward.
Smoking-related pigmentation tends to recur more quickly if smoking continues because tobacco exposure continues to stimulate melanocyte activity.
Drug-induced pigmentation may improve once the causative medication is stopped or adjusted, although medication should never be stopped or changed without discussion with the prescribing clinician.
Factors that may influence recurrence include the original cause of the pigmentation, genetic tendency, skin phototype, smoking, medication and individual melanocyte activity.
Where pigmentation returns, repeat gum depigmentation can usually be considered following appropriate assessment.
Is Gum Bleaching the Same as Gum Whitening?
The terms gum bleaching and gum whitening are commonly used to describe cosmetic gum depigmentation.
However, the procedure is fundamentally different from tooth whitening.
We are not applying a tooth-whitening chemical to the gums. Instead, gum depigmentation involves carefully removing the superficial pigmented epithelial layer responsible for the darker appearance.
The aim is to allow new, naturally lighter gum tissue to heal across the treated area.
Who Is Suitable for Gum Depigmentation?
Most healthy adults with physiological gum pigmentation can potentially be considered for treatment.
However, the first step is always diagnosis.
Patients with a new, rapidly changing, asymmetric or clinically unusual pigmented lesion may require investigation rather than immediate cosmetic treatment.
Similarly, active periodontal disease, uncontrolled inflammation or other oral conditions should be assessed and managed appropriately before elective cosmetic gum treatment.
A specialist periodontal assessment therefore provides more than an aesthetic consultation. It establishes whether the pigmentation is suitable for cosmetic treatment and whether any underlying condition requires attention.
Before and After Gum Depigmentation
Before-and-after photography can demonstrate the changes that are possible following gum depigmentation.
Because gum pigmentation varies significantly between individuals, photographs should always be interpreted in context. The extent of improvement depends on the original pigmentation, its distribution, the underlying cause and the patient’s individual healing response.
Selected before-and-after cases can also be discussed during consultation to help patients understand what may be realistically achievable in their own case.
Before Gum Depigmentation
After Gum Depigmentation
Considering Gum Depigmentation in London?
If dark gums are affecting your confidence in your smile, a specialist periodontal consultation can establish the underlying cause and whether laser gum depigmentation is the right option for you.
At London Specialist Dentists, treatment is planned around the biology of the gums rather than simply their cosmetic appearance.
Where appropriate, the 445nm diode laser can be used to remove the superficial pigmented tissue with careful control of the treatment area.
Gum depigmentation in London is available from £750 per arch, subject to individual assessment.
Frequently Asked Questions About Gum Depigmentation
Is Gum Depigmentation Painful?
Treatment is performed using local anaesthetic where required, so the procedure itself should be comfortable. Many patients experience only mild discomfort afterwards and require little or no pain relief.
Can Dark Gums Come Back?
Yes. Physiological pigmentation can gradually return because the melanocytes responsible for producing melanin remain active. The timing varies between individuals and may range from months to years.
How Long Does Gum Depigmentation Last?
The result can remain stable for many years, but there is no guaranteed permanent duration. Recurrence depends on the underlying cause, genetics and individual melanin activity.
How Much Does Gum Depigmentation Cost?
Gum depigmentation starts from £750 per arch. The final cost depends on the extent and distribution of pigmentation and whether one or both arches require treatment.