Risk perceptions are critical in determining individual's engagement in safe (or risky) actions. This study examined the effect of toolbox training on risk perception dimensions measured as knowledge, dread, and control among a group of employees in a bleach processing plant. Methods: the safety intervention consisted of a 20 min toolbox training covering aspects related to chemical substances, risk identification, health effects, incident pathway, personal protective equipment (PPE), and routine tasks performed. Day and night shift workers were included in the sample since their tasks performed varied considerably, with night shift workers being less likely to be exposed to chemical substances. Perceptions were collected from bleach manufacturing workers via a pre-and postintervention survey. Results: a slight improvement was observed in participants' knowledge, while the dread dimension showed a significant reduction in the mean score post intervention. No changes were identified in the control dimension. Night shift workers gained more knowledge than day workers. Job title and work tenure had no significant impact on any of the risk perception dimensions. Conclusions: the results indicated that toolbox training on hazardous chemicals can impact risk perception dimensions, particularly dread, providing workers with more ways to identify risk levels and addressing any discrepancies that may exist with employees' perception of risk based on their position or tenure within the organization. Organizational training policies should go beyond financial benefits or fulfill regulatory requirements and acknowledge the impact training methods may have on other elements of the safety and health management systems.