Nanotechnology can be used not only in cancer prevention but also treatment. Prevention of cancer is possible through the case of nano-particles being used in sunscreen. Nanopaticles like zinc oxide and titanium oxide are being used in suncreens as they either absorrb or disperse the Ultra-Violet rays from the Sun. This helps in prevention of skin related cancer such as Melanoma. However, there is a general concern on the safety of using these nano-particles when being applied to the skin.

One key reason to be whether the nano-particles would be able to penetrate the outer skin layer and come into contact with the inner skin cells which can pose serious health problems when metal oxides react with living cells within the body. Nonetheless, according to the the Theraeputic Goods Administration in Australia, concerns on nano-particles like zinc-oxide penetrating the outer skin level would be unsubstatiated as research have shown that the metal-oxides remain on the outer layer of the skin. Hence, even though we benefit greatly from the use of nano-technology in commercial products, there remains concerns of product safety we have to look into and require sufficient testing before we can introduce these products into the commercial market. This highlights the importance of regulatory authorities in ensuring the proper process of introducing new commercial consumer products.