Not great, not terrible. For reference how much μSv is dealt with which dental X ray: - Intraoral dental X ray imaging procedure: 1 - 8 μSv - Panoramic examinations: 4 - 30 μSv - Cephalometric examinations: 2 - 3 μSv (Source: https://www.iaea.org/resources/rpop/health-professionals/dentistry/radiation-doses) See more about my Chryssy Geiger Counter: https://www.youtube.com/watch?v=r7HDqopQNpU Another video which talks about this lens and goes into more detail: https://www.youtube.com/watch?v=qm1wh8qlJyc