Implants Can Be Lost Too — Understanding Peri-Implantitis

The Misconception Worth Correcting First

Patients are frequently told that implants cannot decay. That is true. The problem is what people hear next, which is that implants cannot fail.

An implant has two parts to its survival: the titanium fixture, and the bone that holds it. The titanium is chemically stable and immune to caries. The bone is living tissue subject to infection and inflammation, exactly like the bone around natural teeth. When that bone is lost, the implant loses its anchorage — regardless of the fact that the implant itself is in perfect condition.

This condition is called peri-implantitis, and it is the main reason implants are lost after successful integration. It is also, in a large proportion of cases, preventable.

Two Stages, Only One of Them Reversible

Peri-implant disease develops in a sequence, and the distinction between the two stages matters enormously.

• Peri-implant mucositis — Inflammation limited to the soft tissue around the implant. The gum is red, swollen, and bleeds when cleaned. No bone has been lost. At this stage the condition is reversible: with thorough decontamination and improved home cleaning, the tissue returns to health
• Peri-implantitis — Inflammation has extended to the supporting bone, which is progressively destroyed. Pocket depth increases, the implant threads may become exposed, and radiographs show bone level dropping compared with earlier images. Bone loss at this stage does not spontaneously reverse. Treatment can arrest progression and sometimes regain a portion of what was lost, but returning to the original state is not realistic

Almost every case of peri-implantitis passed through a period of mucositis first. That earlier window is the one worth catching, and it announces itself with one reliable sign: bleeding.

Why Implants Are More Vulnerable Here Than Natural Teeth

This is the part rarely explained, and it is the reason implants need more attention rather than less.

• No periodontal ligament. A natural tooth sits in a ligament that carries blood vessels and immune cells right to the point where tooth meets bone. An implant is fused directly to bone with no such layer, so the local immune response at that junction is weaker
• Different fibre orientation. Around a natural tooth, connective tissue fibres insert into the root surface and act as a physical barrier against bacterial advance. Around an implant the fibres run parallel to the surface rather than attaching into it. The seal is less effective
• Reduced blood supply. Peri-implant tissue has fewer blood vessels than tissue around a tooth, limiting both defence and healing capacity
• No pain warning. A tooth with a deep infection generally makes itself known. An implant has no pulp, no nerve, and no ligament pressure sensation. Destruction proceeds quietly

Taken together: the tissue around an implant defends itself less well and warns you later. That combination is why a maintenance schedule is not an upsell.

Who Is at Higher Risk

Risk is not evenly distributed. The factors that matter most:

• A history of periodontal disease — the single strongest predictor. The bacteria responsible are similar, and someone who lost teeth to gum disease carries the same susceptibility to the implants that replaced them
• Smoking — impairs blood supply and healing, and is consistently associated with higher failure rates
• Poorly controlled diabetes — affects both immune response and bone metabolism. Well-controlled diabetes is a much smaller concern
• Residual cement — where a crown was cemented onto the implant abutment, excess cement can be left below the gum line. It is rough, retains bacteria, and is a well-documented trigger. Screw-retained crowns avoid this entirely, which is one reason they are often preferred
• Prosthetic design that cannot be cleaned — if the crown or bridge overhangs such that a brush cannot reach the junction, plaque accumulates where nobody can remove it. This is a design problem, not a patient problem
• No maintenance programme — implants placed and then never professionally cleaned again. Common in patients who travelled for treatment and had no follow-up plan at home

What to Watch For

Because pain arrives late, the early signs are visual and tactile:

• Bleeding when you brush or floss around the implant — the most important early sign, and the one most often dismissed
• Redness or puffiness of the gum collar around the crown
• Gum receding, or the metal margin becoming visible
• A bad taste or odour localised to that area
• Discharge when pressing the gum beside the implant
• Any movement of the crown — this warrants prompt assessment. It may be a loose screw, which is simple to correct, or loss of integration, which is not. The two cannot be distinguished without examination

Assessment is straightforward: gentle probing around the implant to measure pocket depth and record bleeding, plus a radiograph compared against a previous one. That comparison is the whole point — a single image shows the current bone level, while two images taken a year apart show whether it is changing.

How It Is Treated

Treatment follows the stage, and the options are genuinely different.

• Mucositis — Professional decontamination of the implant surface using instruments and air-polishing that will not damage titanium, combined with a revised home cleaning routine. Where excess cement is found, removing it is often the entire treatment. Resolution is the expected outcome
• Early to moderate peri-implantitis — Non-surgical decontamination is attempted first. Where pockets are deep, surgical access is required: the gum is reflected, the exposed implant threads are thoroughly cleaned, and the aim is to arrest further loss
• Moderate loss with a favourable defect shape — Regenerative treatment with grafting material and a membrane may recover part of the lost bone. This depends heavily on the geometry of the defect; contained, bowl-shaped defects respond better than broad flat ones
• Advanced loss or a mobile implant — Removal. This is usually less traumatic than patients expect, and once the site has healed, a new implant can often be placed later. Persisting with an implant that has lost most of its support risks losing additional bone that a future implant would need

Across all stages, the risk factors must be addressed in parallel. Decontaminating an implant while the underlying cause — untreated gum disease elsewhere, continued smoking, an uncleanable prosthesis — remains unchanged produces a temporary result.

What Maintenance Actually Involves

The practical answer to all of the above is unglamorous and effective.

• Professional review every three to six months, including probing and periodic radiographs. The interval is set by your individual risk, not by a standard rule
• Cleaning at the junction, not just the crown — the critical zone is where the crown meets the gum. Interdental brushes sized to the space reach it; a toothbrush alone usually does not
• Water flossers help around implant bridges and full-arch restorations, where access is limited and conventional floss is awkward
• Treat gum disease on the remaining natural teeth — untreated periodontal pockets elsewhere act as a bacterial reservoir that repeatedly reseeds the implant site
• Report bleeding rather than waiting for the next appointment — the reversible stage is short relative to how long implants last

The Short Version

• Implants cannot decay, but the bone that holds them can be lost to infection
• The early stage is inflammation without bone loss, and it is fully reversible
• Bleeding when cleaning is the signal. Pain is not an early sign and waiting for it is waiting too long
• Highest risk: previous gum disease, smoking, uncontrolled diabetes, leftover cement, a prosthesis that cannot be cleaned
• Implants need reviewing every three to six months — more often than natural teeth, not less

Frequently Asked Questions