Some nanomaterials are more toxic than others. Carbon nanotubes, for example, have been compared to asbestos because of their needle-like shape, which can cause lung damage when inhaled. Silver nanoparticles are known for their antimicrobial properties but can also be toxic to human cells. Titanium dioxide nanoparticles, often used in sunscreens, have raised concerns about potential DNA damage and oxidative stress.
