Keratinised Tissue Around Implants: Why the Gum Matters More Here Than It Does Around Teeth

There is a widely repeated statement that implants need a band of firm gum around them. It is true, but stated that way it sounds like a preference. The reason is structural, and understanding it explains why this comes up at implant consultations but rarely at a routine check-up.

Around a natural tooth, the soft tissue is anchored. Collagen fibres run from the gum and insert perpendicularly into the cementum of the root — physically embedded in the tooth. Below that sits the periodontal ligament, suspending the root in bone. The result is a gum cuff that is tied to the tooth and cannot simply be pulled away from it.

An implant has neither. Titanium has no cementum, so no fibres insert into it. Instead, the collagen fibres around an implant run largely parallel to the implant surface, like a cuff of tissue sitting against a post rather than stitched to it. The seal is created by the adhesion of the overlying epithelium and the close adaptation of that parallel fibre layer.

That seal works — it is the reason implants function for decades — but it is inherently less robust than the arrangement around a tooth, and it depends far more on the quality of the tissue forming it. Our article on biological width around implants covers the dimensions involved, and our article on what happens biologically after placement covers the healing sequence.

The mouth has two distinct linings, and the boundary between them is visible.

Keratinised tissue is the firm, pale pink, stippled gum that hugs the necks of the teeth. It is bound down to the underlying bone, does not move when you pull your lip, and has a tough outer keratin layer.

Alveolar mucosa is the redder, shinier, looser lining beyond that boundary. It is mobile, elastic, thin, and full of small blood vessels.

If the tissue immediately around an implant is mobile mucosa rather than firm attached gum, then every time you speak, chew or move your lip, the margin is being tugged. That repeated micro-movement works against a seal that is already relying on adaptation rather than anchorage.

It also makes the area harder to clean. A soft, mobile, tender margin is brushed timidly, plaque accumulates, and inflammation follows.

The figure most often quoted is a width of at least two millimetres of keratinised tissue, of which at least one millimetre is firmly attached.

Implants with less than that are more frequently associated with:

• Higher plaque accumulation, largely because cleaning is uncomfortable

• More bleeding on probing and gum inflammation

• More discomfort during brushing and during professional cleaning

• Greater soft tissue recession over time, with aesthetic consequences at the front of the mouth

What the evidence does not show is that a narrow band condemns an implant. Many implants with minimal keratinised tissue remain stable for years where cleaning is meticulous. The band makes maintenance easier and the tissue more stable; it is a favourable condition rather than a requirement. Our article on the role of attached gingiva in peri-implant stability covers this in more depth.

Width — how far the band extends from the implant outwards — is the commonly discussed measure. Thickness is a separate dimension and matters independently.

A thin tissue type is more prone to recession, and more likely to allow the grey of underlying titanium to show through, which is a particular concern at the front of the mouth. Thicker tissue is more forgiving of small positioning variations and more stable long term. Our article on soft tissue architecture and implant aesthetics and our article on how gum shape affects implant results cover the aesthetic dimension.

Several factors reduce the available band:

• The reason the tooth was lost. Advanced gum disease or an abscess destroys tissue as well as bone.

• Time since extraction. The ridge remodels and narrows, and the keratinised band narrows with it.

• Long-term denture wear, which accelerates ridge resorption.

• Natural tissue type. Some people simply have a narrow band and thin tissue throughout.

• Site. The lower back jaw commonly has the least keratinised tissue and the most muscle pull.

Where the band is judged inadequate, several approaches are used, and the timing varies.

Free gingival graft. A thin layer of keratinised tissue taken from the palate and placed at the implant site. This reliably increases the width of keratinised tissue. The colour match is often imperfect, so it is used more readily in the back of the mouth.

Connective tissue graft. Tissue taken from beneath the palatal surface and placed under a flap. This increases thickness and gives a better colour blend, making it the usual choice where appearance matters.

Apically repositioned flap. Existing keratinised tissue is repositioned rather than grafted, where enough is present but sitting in the wrong place.

Substitute materials. Collagen matrices avoid a second surgical site at the palate and are used in selected cases.

Timing options include before implant placement, at the time of placement, at the second-stage appointment when the implant is uncovered, or later if a problem emerges. Doing it at uncovering is common, because the tissue is being handled anyway.

Whether or not grafting is done, maintenance is what determines the long-term picture.

Cleaning around an implant differs from cleaning a tooth — the contour is different and there is no ligament to give feedback. Our article on cleaning an implant compared with a natural tooth, our article on oral hygiene with implants and our article on interdental brushes versus floss around implants cover the practical methods.

Signs that warrant assessment include bleeding when you clean the area, tenderness that does not settle, a change in the shape or colour of the gum, more of the restoration becoming visible, or any discharge or persistent bad taste. Our article on early signs of peri-implantitis, our article on identifying peri-implantitis symptoms and our article on sore gums around an implant cover what these can mean.

The crown itself contributes too. A restoration with a bulky or inaccessible contour makes cleaning harder regardless of how good the tissue is. Our article on crown margin placement and gum health covers the design side.

• Gum fibres insert into a natural tooth root; around an implant they run parallel to the surface, so the seal relies on tissue quality.

• Mobile mucosa at the margin is tugged during normal function and is uncomfortable to clean.

• A band of around two millimetres of keratinised tissue is associated with less plaque, bleeding and recession.

• Thickness is a separate consideration from width and matters particularly for appearance.

• Grafting can be done before placement, at placement, at uncovering, or later.

• A narrow band does not condemn an implant; it raises the standard of maintenance required.

If cleaning around an implant is uncomfortable, or the gum margin has changed, an assessment establishes what is happening. You can contact our team, read about dental implants, or arrange hygiene care for implant maintenance.

This article is provided for general information only and does not constitute dental advice. Soft tissue requirements and the suitability of grafting depend on the individual site, tissue type and implant position, and can only be determined through clinical examination. Outcomes vary between individuals.

Next review due: 13 August 2027