Dozens of toothpastes sold at supermarkets are at the centre of a cancer alert today. Anti-bacterial cleaning products, including dishwashing liquid and handwash, are also affected. Researchers have discovered that triclosan, a chemical in the products, can react with water to produce chloroform gas. If inhaled in large enough quantities, chloroform can cause depression, liver problems and, in some cases, cancer. An Evening Standard investigation found dozens of products on supermarket shelves containing the chemical, from brand names including Colgate, Aquafresh, Dentyl and Sensodyne. Marks& Spencer confirmed today it was removing products containing triclosan from all its stores and has...