Root canal treatment (RCT) consists in eliminating infected and / or inflammatory tissues inside the root canal system of the tooth by a chemo-mechanical preparation and then filling the latter in a three-dimensional, bacteriostatic and durable way to allow healing. This treatment is commonly carried out and can sometimes be long and tedious, as for example on molars with several roots.

According to numerous studies, patients consider endodontic treatments as one of the most stress-inducing dental procedures. Another study also reports satisfaction during root canal treatment in public health service. There is a paucity in literature about patients'experience of endodontic treatment when they are carried out by dental students.

The main objective of this study is to investigate patients' experience of root canal treatment in Brest dental university hospital through a qualitative methodology, with individual interviews, a verbatim transcription, followed by a qualitative analysis . This type of research can enable to keep a broad approach of patients' experience and to stay faithful to it.

Volunteer patients are recruited during their endodontic treatment in Brest Dental Hospital. At the end of the treatment, the patients are asked to take part in an individual interview. The interview is carried out by a single investigator with the help of a question route, until data saturation. The interviews are transcribed verbatim and anonymously by the main investigator. The interviews are read by qualitative Analysis by two investigators in order to determine codes, gathered in categories. Then, the results will be written and discussed in an article.

Inclusion Criteria:

• Patients of legal age who volunteered to participate in the study, having formulated their non-opposition
• Patients having been treated in the dental department of Brest dental university hospital by a dental student for an endodontic (=root canal) treatment

Exclusion Criteria:

• patient who has formulated his opposition
• patients not requiring endodontic treatment
• minor patients
• patients treated by the consultants or residents
• patients taking opioids, powerful psychotropic drugs or having taken Atarax® before the treatment or interview
• patients who are cognitively impaired or have a disability that impairs comprehension (hearing, speech)
• patients under the influence of drugs or alcohol

Volunteer patients of Brest Dental University Hospital treated by endodontic (root canal) treatment