Herpes simplex virus type 1 (HSV-1) belongs to the family of human herpes virus, is latent in the body and will be activated if induced by triggering factors. Herpes labialis is one of recurrent lesions of HSV-1. Herpes labialis triggering factors include mucosal tissue trauma of the oral cavity or nerve tissue, stress, ultraviolet light, immunosuppressed conditions, hormonal disorders and fatigue. This case report discusses about recurrent herpes labialis which is thought to be triggered by dental procedures. Case Report: A 37-year-old male presented to the Dental Hospital of Universitas Indonesia with chief complaint of soreness on the lips. A few days before, he under-went dental treatments, which are scaling and root canal treatment. After those dental treatments, blisters appeared on the lower lip and he experienced fever and joint pain. This condition had been experienced before and also arises after dental treatment. Clinical examination showed painless brownish yellow crust accompanied by ulcers at the left lower lip. Based on the history and clinical examination the patient was diagnosed with herpes labialis. The pa-tient was instructed to apply sterie gauze moistened with 0.2% chlorhexidine gluconate for 2 minutes 3 times a day. Conclusion: Dental treatments may be served as triggering factor for herpes labialis. This condition can be avoided by minimizing trauma and increase time effectiveness during dental treatment.