Bulgari cosmetic research co-ordinator Jean-Paul Marty discusses the benefits and pitfalls of different methods of exfoliation. 'The use of an exfoliating product allows the skin to get rid of dead cells and impurities that cannot be removed with a simple cleansing programme. If the skin is not adequately exfoliated, dead cells and impurities clog its surface, making the penetration of other treatments less effective. There is no 'best in class' exfoliant - each one has pros and cons. 'A mechanical scrub guarantees good exfoliating power, but they can provoke rashes on dry and sensitive skin. Chemical scrubs promise a regular, homogenous and deep exfoliation, but this technique, based on the use of fruit or flower acids, might be irritating and cause an unpleasant burning sensation for people with sensitive skin. 'Biological scrubs ensure regular and homogenous exfoliation. There's no need to massage them onto the face and they contain known biological ingredients such as enzymes, which are effective without being irritating and which can be used by those with sensitive skin. However, their exfoliating power may not be strong enough to meet the needs of combination or oily skins.'