ABSTRACT Background: Toombak is a traditional type of smokeless tobacco used by people in Yemen, especially in Dawan Valley, Hadramout Province, Yemen. Smokeless tobacco use may be considered as a predisposing risk factor for several oral diseases. Case presentation: This paper presents two cases. The first is that of a 27-year-old male toombak user with severe periodontitis and oral melanosis. The second case is that of a 44-year-old male toombak user with oral hypermelanosis. The patient was subjected to scaling and polishing. Quit toombak counseling was conducted, and instruction was given to the patient about the adverse effects of toombak usage. Conclusion: Oral tissues are severely affected by toombak usage. Thus, comprehensive toombak prevention programs should be implemented to reduce toombak-associated diseases.

Keywords: Toombak, smokeless tobacco, melanosis, periodontitis, case report.