Since January of 2013, peroxide based tooth whitening systems are no longer legal in the United Kingdom, or anywhere in the EU, for that matter. They have been deemed harmful to the enamel, and the risk of overexposure and of possible misuses and of patients harming themselves with the products have been deemed too great, and thus the peroxide based tooth whitening products are no longer legally for sale. However, many alternatives have stepped in to fill the gap caused by this new legislation.