Limitation is a legal question, not a clinical one, and nothing in this article should be read as legal advice. But limitation issues come up often enough in dental negligence enquiries that it is worth setting out, in general terms, where expert dental evidence tends to fit into the analysis, so that instructions can be timed sensibly. This article addresses the position in England and Wales; other jurisdictions differ, sometimes materially.
The basic position
Claims in negligence, including dental negligence, are subject to a three-year limitation period under the Limitation Act 1980. For personal injury and clinical negligence claims, time generally runs from the date the cause of action accrued (broadly, when the damage occurred, which is not always the date of the treatment itself), or from the claimant's date of knowledge if later. For claimants who were under 18 at the date of the alleged negligence, the three-year period does not begin to run until their eighteenth birthday.
Date of knowledge
Date of knowledge is where most of the difficult limitation arguments arise. A claimant's date of knowledge is the date they first knew that the injury was significant, that it was attributable in whole or in part to the act or omission alleged to constitute negligence, and the identity of the defendant. Knowing that an outcome was poor is not the same as knowing it was attributable to substandard care. Many dental patients reasonably assume that pain, tooth loss or the need for further treatment is simply an unfortunate but unavoidable outcome, until something, often a second opinion from another dentist, prompts them to question whether the original treatment fell below standard.
This difficulty is compounded in dentistry because much of the relevant pathology is silent. A root canal treatment may fail radiographically while the patient remains symptom-free for years; peri-implant bone loss can progress without pain or any sign the patient could detect; and a defective crown margin may only become apparent on a radiograph taken long after the treatment was provided. In such cases the point at which a claimant could reasonably have connected a poor outcome to the original treatment may fall considerably later than the point at which the treatment in fact failed.
This is where expert dental evidence sometimes becomes relevant to the limitation argument itself, not just to the merits of the underlying claim. When a claimant says they did not appreciate that their treatment might have been negligent until a particular date, the surrounding clinical picture can support or undermine that account: what was visible on examination, what was or was not explained to the patient at the time, and what a patient in that position could reasonably have been expected to understand. This is distinct from the later question of whether the treatment actually amounted to a breach of duty, which is assessed separately once limitation is resolved.
Why early expert input can matter
Solicitors sometimes hold off instructing an expert until limitation is resolved, on the basis that there is little point commissioning a report on a claim that might be time-barred. That is often the right call, but it is worth being alert to cases where a preliminary expert view, even a screening review of the records rather than a full report, can usefully inform the limitation argument itself, particularly where date of knowledge is contested and the clinical picture bears on what the claimant could reasonably have known and when.
Where limitation is in genuine doubt, raising it early with whoever is being instructed, and being clear about what is needed at that stage, screening input on the merits, a view on date of knowledge issues, or a full report, helps avoid wasted work and keeps the case on a sensible timetable. The court retains a discretion under section 33 of the Limitation Act to allow a claim to proceed outside the primary limitation period, but this is decided on the specific facts and should not be relied upon as a default position.
This article is necessarily general. Specific limitation questions, including date of knowledge and any application under section 33, are legal matters for the instructing solicitor to advise on, informed where appropriate by expert dental evidence on the underlying clinical picture.