Aim: to assess the impact of e-learning through different e-resources among health sciences students. Methodology: A cross-sectional design was conducted among health science students (n = 211; 134 female and 77 male) at King Saud University, Saudi Arabia. The data was collected using a previously used structured questionnaire to assess the impact of e-resources on learning. Results: The four most frequently used e-resources were: Zoom (38%), YouTube (31%), Google applications (29%), and Blackboard (27%). More than one-third of the students (35%) reportedly used e-resources for three or more hours daily. The majority of the students (55.9%) recognized a gender-related and age-related difference among faculty members in terms of e-resources usage. The majority of the students (58.2%) believe that online resources recommended by faculty members were credible. The majority of students believed that their academic performance was primarily influenced by these features of the e-resources: organization/logic of the content (64.5%), the credibility of the video (64.5%), and up to date “look and feel” of the video (60.6%). The study identified the most frequently used e-resources, gender, and age-related differences in faculty members’ use of e-resources, students’ overwhelming reliance on faculty feedback regarding the credibility of e-resources, and three most important characteristics (organization, credibility, and updated status) of e-resources. Conclusion: e-learning resources had a significant impact on participating students’ education as they were used very frequently during their health sciences’ courses.

Aim: To investigate the effects of selected alcohol-free mouthwashes with different formulations (zinc-hydroxyapatite, hydrogen peroxide, and sodium fluoride) on the surface microhardness of a single-shade universal resin composite. Materials and Methods: Forty disc-shaped specimens (8 × 2 mm) from the universal resin composite (Omnichroma®), and a nano-hybrid composite (Tetric® N-Ceram) were prepared. After polymerization, baseline surface microhardness values were recorded using Vickers microhardness tester. The samples from each material were randomly assigned to 4 groups ( n = 10) and immersed in 20 ml of the mouthwashes: Biorepair®, Listerine®, Colgate® Optic White, and distilled water (control). The samples were kept in the immersion solutions for 24 hours, and post-immersion microhardness values were recorded. Data were analyzed with one-way ANOVA and paired sample t-tests at p < .05. Results: Significant reduction in microhardness was observed in all resin composite groups after immersion in the mouthwashes compared to baseline values ( p < .0001). The highest microhardness reduction in Omnichroma® group was observed after immersion in Colgate® Optic White; and Tetric® N-Ceram group after immersion in Listerine® mouthwash. For both materials, the least reduction in microhardness was observed after immersion in Biorepair®. Microhardness values for Omnichroma were significantly higher than Tetric® N-Ceram ( p < .0001). However, Omnichroma exhibited a significantly greater reduction in microhardness after immersion in the tested mouthwashes. Conclusion: In vitro simulated use of the investigated mouthwashes negatively affected the surface microhardness of both tested resin composites. The observed effects were both mouthwash and material dependent.