Abstract
This in vitro study aimed to examine the effects of popular Saudi Arabian beverages on tooth shade after home bleaching. A total of 60 extracted single-rooted teeth were used, of which 45 teeth were bleached using a 35% carbamide peroxide gel and an LED light. After bleaching, the teeth were immersed in three different beverages-Cola, Arabic Qahwa, and Black Coffee-for 14 days, while a control group of unbleached teeth (n = 15) was also exposed to the same beverages (5 teeth/ beverage). Tooth color changes were assessed using a spectrophotometer before and after immersion. Statistical analysis was conducted using Mann-Whitney and t-tests, with significance set at p < 0.05. Results showed that after bleaching, the Cola group had a slightly higher mean E1 value compared to the control, but the difference was not statistically significant (p = 0.087). After 14 days of immersion, both the Cola and control groups exhibited increased changes in tooth shade, with no significant difference in ΔE values. In contrast, the Arabian Qahwa group showed significantly (p = 0.001) greater discoloration than the control group, indicating a stronger staining effect. For the Black Coffee group, the mean E2 value was 16.04 ± 2.97, while the control group had a higher mean of 19.2 ± 2.09, with a statistically significant difference (p = 0.044). The study concluded that beverages such as Cola, Arabic Qahwa, and Black Coffee can influence tooth shade over time. Black Coffee caused significant discoloration, whereas Cola showed statistically insignificant changes. However, Arabic Qahwa led to significant differences in ΔE values compared to the controls, indicating a notable effect on tooth shade.