Executive Summary: Key Legal and Evidentiary Issues

• A denture wearer sought $9,880 in damages, alleging poor-quality dentures caused repeated breakage over several years.
   
• Both defendants denied fault, arguing any breakage resulted from the plaintiff's own actions, such as dropping the denture.
   
• No expert evidence was submitted to establish that the dentures failed to meet the durability or quality expected of such a product.
   
• Quebec courts have consistently held that proving a denturologist's professional fault requires expert testimony, since judges lack judicial notice of denturology standards.
   
• Judicial notice under the Civil Code of Québec is narrowly confined to notorious public facts and common knowledge, not to technical or professional standards.
   
• The claim's evidentiary gap, combined with the dentures having already reached the end of their five-year useful life, proved fatal to the plaintiff's case.
   

Facts of the case

Nathalie Gagnon purchased a lower implant-supported denture and an upper conventional denture in August 2020 for $6,800, from Clinique de denturologie F. Jean inc. and its owner, denturologist François Jean. The dentures functioned without issue until April 20, 2022, when an incisor chipped and was repaired by regluing. A similar chip occurred on September 7, 2022, again repaired by the clinic. Mr. Jean maintained that Ms. Gagnon had told him the denture was dropped on at least one occasion. Two further breakages occurred on March 15 and May 23, 2023, and repairs were made to the denture. Notably, the implant-supported lower denture never broke; only the conventional upper denture was affected. More than two years after the defendant's last repair, on September 29, 2025, Ms. Gagnon had a third party replace two teeth on the denture, by which point the prosthesis was five years old. At the hearing, she acknowledged that dentures are generally replaced every five years, a timeline consistent with Mr. Jean's own assessment of the product's durability.

Policy and legislative provisions at issue

The case turned on the burden of proof under the Civil Code of Québec. Article 2803 requires a party asserting a right to prove the facts supporting that claim, while article 2804 sets the standard at a preponderance of evidence — proof that renders a fact's existence more probable than not. Article 2806 was also central: it excuses a party from proving matters of which the court has judicial notice. The Tribunal found this provision inapplicable here, since it has no judicial notice of the technical durability or appearance standards for dental prostheses. Drawing on Catherine Piché's writing on civil evidence, the Tribunal distinguished between facts properly subject to judicial notice — such as geography or the ordinary course of nature — and specialized or technical matters, such as denturology standards, which fall outside that narrow category and must be proven through evidence.

Reasoning and analysis

The Tribunal held that Ms. Gagnon bore the burden of proving that her dentures lacked the durability or quality reasonably expected of such a product, and that she failed to meet this burden because she submitted no expert opinion or technical documentation assessing the product's quality. A complaint she filed with the Ordre des denturologistes du Québec did not result in disciplinary action, and no evidence from that process was before the court. The Tribunal relied on a consistent line of Quebec case law — including Rodrigue c. Donici, Routhier c. Cabana, Harvey c. Dany Fillion D.D. denturologiste inc., and Plourde c. Magalie Hupfer Denturologiste inc. — establishing that proof of a denturologist's professional fault generally requires expert evidence, since courts lack the specialized knowledge to assess whether a denturologist acted prudently and diligently. Absent such expert evidence, these decisions confirm that claims against denturologists are routinely dismissed. The Tribunal also observed that a syndic's investigation report is not equivalent to expert evidence on fault. Beyond the evidentiary gap, the Tribunal noted that the dentures had already reached the end of their expected five-year useful life, meaning it could not have awarded replacement value even had Ms. Gagnon proven fault.

Ruling and overall outcome

The Tribunal dismissed Nathalie Gagnon's claim in its entirety, finding that she had not proven professional fault on the part of Clinique de denturologie F. Jean inc. or François Jean due to the absence of expert evidence establishing that the dentures fell short of expected durability or quality standards. Legal costs were awarded against Ms. Gagnon, the unsuccessful party. No monetary amount was ordered in favour of any party beyond costs, and the judgment does not specify a quantum for those costs.