Until September 6, 2007, the European Commission (EC) Scientific Committee on Consumer Products (SCCP) is accepting comments on its Preliminary Opinion on the Safety of Nanomaterials in Cosmetic Products. According to the SCCP, traditional risk assessment methods — hazard identification, hazard characterization, and exposure assessment — may not be suitable for nanomaterials in cosmetics.  The SCCP suggests that either a new method should be developed, or the existing methodologies for hazard characterization and exposure assessment should be validated.  The SCCP recommends that the risk assessment of nanoparticles in cosmetics should be carried out on a case-by-case basis, taking into account the specific physical, chemical, and surface area characteristics of nanomaterials.  Previous safety evaluations on nanomaterials used in cosmetics would also need to be revised.