A French ban on the production and sale of cosmetics and most clothing containing polluting and health-threatening forever chemicals" goes into force on Thursday. Per- and polyfluoroalkyl substances (PFAS) are human-made chemicals used since the late 1940s to mass produce the non-stick, waterproof and stain-resistant treatments that coat everything from frying pans to umbrellas, carpets and dental floss. Because PFAS take an extremely long time to break down " earning them their "forever" nickname " they have seeped into the soil and groundwater, and from there into the food chain and drinking water. The French law, approved by lawmakers in February, bans the production, import or sale from January 2026 of any product for which an alternative to PFAS already exists. These include cosmetics and ski wax, as well as clothing containing the chemicals, except certain "essential" industrial textiles. It will also make French authorities regularly test drinking water for all kinds of PFAS. A handful of US states, including California, implemented a ban on the intentional use of PFAS in cosmetics beginning in 2025, and several other states are slated to follow in 2026. Denmark has banned the use of PFAS in food packaging since 2020. The European Union has been studying a possible ban on the use of PFAS in consumer products, but has not yet presented or implemented such a regulation.