The study is designed as a pilot study. The primary objective of the current study is to collect data on the expression and progression of tooth structure loss in dental students under stressful conditions and different dietary habits using intraoral scanners (IOS). Stress levels will be evaluated using Percived Stress Scale (PSS-10). Eating habits will be queried using reflux and dietary questionnaires. The data obtained will later be used in the case-control design of a multicenter study on the same topic. Conducting the pilot study will allow for a critical evaluation of the study's design, participant retention rate, and recruitment process.

The first scan (baseline: T0) is performed during the Dental Prosthetics I course, at the beginning of the 8th semester. Follow-up scans T1 and T2 are performed at the beginning of the 10th semester and after completion of the state examination. The scans are performed by a study doctor or doctoral student using a digital intraoral scanner (Trios, 3 Shape, Denmark). Accompanying the scanning process, study participants will be asked to complete a questionnaire regarding stress levels (PSS) and dietary habits. A medical history and dental findings are also collected. Each scan will take no longer than 10 minutes. The entire examination will take no longer than 45 minutes. The T0 and T1, T2 scans will be overlaid with evaluation software and compared in terms of tooth wear.

Inclusion Criteria:

• At the time of the baseline examination of the study the participants must be dental students and participate in the Dental Prosthetics Course I in the summer semester 2023, at the Dental School of Medical Faculty Carl Gustav Carus at the Technical University of Dresden
• Presence of study teeth (at least one antagonist pair of first molars (16/46 or 26/36).
• Complete dentition, if necessary, dentition with complete gap closure up to the first molar in the maxilla and mandible
• Presence of a canine guidence
• Written informed consent of the participating persons

Exclusion Criteria:

• Age <18 and >40
• Study teeth restored with dentures
• Extensive restorations over 1/3 of the occlusal surface on the study teeth
• Removable dentures
• Ongoing orthodontic treatment
• Existing pregnancy/lactation
• Addiction or other medical conditions that do not allow the subject to understand the nature and scope and possible consequences of the clinical study
• Indications that the participant is unlikely to comply with the protocol.

Study participants will be dental students enrolled in Dental Prosthetics Course I at the beginning of the observation period.