Yes, it is possible to transmit HSV-1 (oral herpes) through unprotected oral sex even if there are no visible outbreaks present. Herpes can sometimes be transmitted when there are no symptoms or sores (asymptomatic shedding). Using protection like condoms and dental dams during sexual activity can help reduce the risk of transmission. If you have concerns about your risk or need more information, consider speaking with a healthcare provider for personalized guidance on preventing transmission.