Yes, to the extent that you follow the instructions laid out in the product manual. Nose hair trimmer makers are constantly working on ways to make them safer for users. They install sharp, high-quality stainless steel blades to minimize the possibility of your hairs getting caught there as they rotate. Dual-edge blades increase efficiency to reduce the risk of you injuring yourself as you go over the same spot multiple times. Some trimmers come with a guarded cutting system to further reduce the chances of you injuring your skin. Yet more advanced models have sensors that automatically shut the gadget off if it comes too close to the skin. But even the most advanced safety features can be rendered ineffectual if the user fails to heed usage instructions.