Identifying Peri-Implantitis Early: Signs, Thresholds and Intervention

The difficulty with peri-implantitis is not that it is hard to treat. It is that by the time most patients notice something, the disease has already moved past the stage where reversal is straightforward.

Implants have no periodontal ligament, and with it none of the nerve supply that makes a diseased natural tooth ache, feel high on biting or become tender to touch. An implant losing bone can feel entirely normal for a long time. That is why the condition is defined and monitored by measurement rather than by symptoms.

Our companion article on the early signs of peri-implantitis covers what a patient can notice at home. This one deals with the clinical side: the thresholds your dental team uses, the difference between the two disease stages, and what intervention involves at each point.

The distinction matters enormously, because the outlook differs.

Peri-implant mucositis is inflammation confined to the soft tissue around an implant. The gum is red, swollen or bleeds when probed, but the supporting bone is unchanged. This stage is generally reversible with thorough professional cleaning and improved home care — much as gingivitis around a natural tooth resolves when plaque is controlled.

Peri-implantitis is the same inflammatory process extended into the bone. There is bleeding on probing plus measurable bone loss beyond the normal remodelling that occurs in the first year after placement. Bone that has been lost does not reliably return. Treatment aims to arrest progression and stabilise the implant rather than to restore what has gone.

The practical implication is that almost all the value of monitoring sits in catching the mucositis stage. Our article on the difference between gingivitis and periodontitis describes the same two-stage pattern around natural teeth.

Three measurements are used together. No single one is diagnostic on its own.

A calibrated probe is passed gently into the sulcus around the implant. Bleeding indicates that the tissue lining that space is ulcerated and inflamed. Its real value is the opposite: an implant that does not bleed on probing is very unlikely to be actively diseased, which makes it a reliable way of ruling problems out.

Probing an implant is done with light force. Suppuration — pus expressed from the margin — is a stronger signal and is taken seriously whenever it appears.

An absolute depth means little around implants, because the restoration is often placed deliberately deep to allow the gum to emerge naturally around it. What matters is change. A pocket that measured 3 mm at the time the crown was fitted and measures 6 mm three years later has told you something, even if 6 mm would be unremarkable elsewhere.

This is why a baseline record taken when the restoration is first fitted is so useful, and why implant patients are asked to attend the same clinician or practice for review where possible.

A standardised radiograph, taken with the beam perpendicular to the implant so the threads are clearly resolved, allows the bone level to be measured against a fixed landmark on the implant itself.

Some bone change in the first year is physiological remodelling and is expected. Bone loss beyond that initial settling — particularly if it is progressing between one review and the next — is what defines peri-implantitis. Where no baseline radiograph exists, clinicians rely on the pattern and extent of loss instead.

Symptoms are an unreliable early warning system, but they are not worthless. The changes worth reporting are:

• Bleeding when brushing or cleaning around one particular implant, especially if it is confined to that site

• Gum around the implant that looks redder, puffier or shinier than the tissue elsewhere

• A bad taste or persistent odour localised to one area

• The crown appearing longer, or a dark metal margin becoming visible as tissue recedes — covered in our article on what to do when an implant screw or abutment becomes visible

• Food packing into a space that did not previously trap food

• Any sense of movement, however slight

Movement is the one that should prompt a prompt appointment rather than a routine one. Our article on gums that hurt around an implant covers the discomfort side in more detail.

Pain is a late and inconsistent finding. Its absence should never be taken as reassurance.

Peri-implantitis is a biofilm-driven disease, but susceptibility varies widely, and the factors below shift the risk.

A history of periodontitis is the strongest single predictor. Patients treated for gum disease before implant placement remain at higher risk afterwards and generally need shorter recall intervals. Our article on implants in patients with a history of gum disease covers this in detail.

Smoking impairs the blood supply and the local immune response in a way that is directly relevant to peri-implant tissues. See our article on long-term implant outcomes in smokers.

Poorly controlled diabetes affects wound healing and inflammatory regulation. Our article on how diabetes affects implant eligibility and healing sets out the practical picture.

Cleaning access built into the restoration. A crown with over-contoured emergence or a deep, inaccessible margin makes plaque control genuinely difficult for the patient. This is a design issue rather than a hygiene failure, and it is discussed in our article on how implant crown design affects long-term maintenance.

Residual cement from a cemented restoration, left in the sulcus, behaves as a chronic irritant and is a recognised trigger.

Excessive occlusal load does not initiate the disease, but it appears to accelerate bone loss once inflammation is established. Our article on protecting implants from excessive bite forces explains how loading is managed.

Absent maintenance. Implants placed and then never reviewed accumulate problems silently. The single most effective preventive measure is a structured recall.

Treatment escalates with the stage, and the earlier stages are considerably less involved.

Professional debridement of the implant and restoration surface using instruments that do not scratch titanium, removal of any retained cement, and a review of home cleaning technique. Where the crown contour is the obstacle, modifying or remaking it may be the more durable answer. Reassessment usually follows in six to eight weeks to confirm the inflammation has resolved.

Non-surgical debridement, sometimes supported by local antimicrobials or air-polishing with a low-abrasive powder, alongside correction of whatever is driving the problem — occlusion, contour, cleaning access or a modifiable medical factor. Progress is judged at reassessment by whether bleeding has stopped and depths have stabilised.

Surgical access is often required so the implant surface can be decontaminated directly under vision. Depending on the shape of the defect, this may be combined with reshaping the surrounding bone and soft tissue to make the area cleanable, or with regenerative grafting where the defect contains the graft material well. Outcomes vary with defect morphology, implant surface and how well plaque is controlled afterwards.

Where bone loss is extensive or the implant is mobile, removal may be the appropriate course. Our article on replacing a failed implant explains what that pathway involves, and early versus late implant failure sets out how timing changes the likely cause.

For most implant patients, the meaningful preventive step is not a product but a schedule.

A typical maintenance visit includes probing all sites around each implant with a baseline to compare against, checking for bleeding and suppuration, assessing the restoration for looseness or wear, reviewing cleaning access, and taking radiographs at intervals judged on individual risk rather than a fixed timetable.

Between visits, cleaning below the crown contour is what counts. Interdental brushes sized correctly for the space, or a water flosser where access is awkward, reach where a toothbrush cannot. Our articles on cleaning an implant compared with a natural tooth and water flossers for implants cover the practical detail.

• Peri-implant mucositis is reversible; peri-implantitis involves bone loss that does not reliably return

• Diagnosis rests on bleeding on probing, change in probing depth against baseline, and radiographic bone level — not on symptoms

• Implants lack the nerve supply that makes a diseased natural tooth ache, so pain is a late and unreliable sign

• A history of periodontitis is the strongest risk factor, followed by smoking and poorly controlled diabetes

• Restoration design and retained cement are common local causes, and both are correctable

• Structured maintenance with a recorded baseline is what makes early detection possible

Can peri-implantitis be reversed?

The bone that has been lost does not reliably regenerate, so the aim of treatment is to arrest the disease and stabilise the implant. The earlier stage — peri-implant mucositis, where only the soft tissue is inflamed — does respond well to thorough cleaning and improved home care. This is the reason regular monitoring matters so much.

Does peri-implantitis hurt?

Often not, or not until it is well advanced. Implants have no periodontal ligament and therefore none of the nerve supply that makes a natural tooth tender when infected. Bleeding, swelling, a bad taste or a change in the gum's appearance are more common early signals than pain.

How often should implants be checked?

It depends on individual risk. Patients with a history of gum disease, smokers and those with diabetes are generally reviewed more frequently than the standard interval. Your clinician will set a recall based on your own risk profile rather than a fixed rule.

Is bleeding around an implant always serious?

Bleeding on probing indicates inflammation and should be assessed, but it does not on its own mean bone is being lost. It may reflect mucositis, which is treatable and reversible. Distinguishing the two requires probing measurements and, where indicated, a radiograph.

Can an implant with peri-implantitis be saved?

Frequently, yes — particularly where the condition is identified before bone loss becomes extensive and where the underlying cause can be corrected. Where loss is severe or the implant has become mobile, removal and a fresh plan may be the more predictable route.

Does having gum disease mean I cannot have implants?

Not necessarily. It means the gum disease needs to be treated and stabilised first, and that ongoing maintenance becomes an integral part of the plan rather than an optional extra. Suitability is determined by clinical assessment.

If you have an implant and have noticed bleeding, a change in the gum around it, a bad taste or anything that feels different, arrange an assessment rather than waiting for the next routine visit. If it has been several years since your implant was reviewed with probing and radiographs, that is worth addressing regardless of symptoms.

You can contact our team to arrange an appointment at our Wimpole Street practice. Our dental implants and gum disease treatment pages explain what assessment and treatment involve.

This article provides general information about peri-implant disease and does not constitute individual dental advice. Peri-implantitis can only be diagnosed through clinical examination, probing measurements and radiographs, and treatment recommendations vary considerably between patients. Anyone experiencing symptoms around a dental implant should seek an assessment from a registered dental professional. Wimpole Dental is regulated by the Care Quality Commission, and our clinicians are registered with the General Dental Council.

Next review due: 3 September 2027