Associations between Dental Anxiety Levels, Self-Reported Oral Health, Previous Unpleasant Dental Experiences, and Behavioural Reactions in Dental Settings: An Adult E-Survey

<i>Background and Objectives</i>: The aim of this study was to investigate the prevalence of dental anxiety, its association with self-reported oral health, and sociodemographic factors in adults that are critical for improving oral health and well-being. <i>Materials and Methods</i>: An online survey was conducted via social media, with 1551 adults (76.5% women, 23.5% men) participating nationwide. Data collected included demographic data, Modified Dental Anxiety Scale (MDAS) scores, and associations between dental anxiety, negative experiences, and self-reported oral health. The analysis included psychophysiological, behavioural, and emotional responses and avoidance of dental visits, using descriptive and generalised linear regression models. <i>Results</i>: This study found that the mean score of the MDAS was 9.70 ± 5.11 out of 25, 19.1% of the participants reported no dental anxiety, and 7.8% suffered from dental phobia. Gender, age, and socioeconomic status had no significant effect on the prevalence of anxiety. Although more than half of the participants reported negative dental experiences, particularly in childhood, anxiety levels were unaffected. However, those who rated their oral health as excellent or very good had lower anxiety scores (<i>p</i> = 0.008, <i>p</i> = 0.024). Among the dental procedures, oral surgery (58.7%) and prosthetic (restorative) dental treatments (15.2%) caused the most anxiety. Avoidance behaviour correlated with increased anxiety (<i>p</i> ≤ 0.001), as did postponing dental visits until severe pain occurred (<i>p</i> = 0.011). <i>Conclusions</i>: These results emphasise the significant prevalence of dental anxiety in adults, particularly for surgical procedures and drilling, posing challenges in patient management. Tailored strategies are essential to reduce anxiety, improve patient well-being, and optimise dental service delivery and treatment efficacy.