This review aims to explore the determinants and impact of passive smoking on oral health among adults in Malaysia. Passive smoking, also known as second hand smoke exposure, refers to the inhalation of tobacco smoke emitted by active smokers in the surrounding environment. While the adverse effects of active smoking on oral health are well-documented, the specific impact of passive smoking on oral health in Malaysia requires further investigation. This review will examine the determinants of passive smoking, including social and cultural factors, as well as the consequences it has on oral health, such as periodontal diseases, oral cancer, and dental caries. By understanding these determinants and consequences, appropriate interventions can be implemented to reduce passive smoking and its detrimental effects on oral health.