Article 10(2) of Regulation (EU) 2017/852 on Mercury.

UK law states that dental amalgam should not be used in the treatment of deciduous teeth, in children under 15 years-old, and in pregnant or breastfeeding women, except when deemed strictly necessary by a dentist based on the specific medical needs of the patient.

The law has been passed on the basis of environmental concerns about mercury pollution, and does not reflect any evidence-based concerns about adverse effects of amalgam on human health.

Read the full regulations here: https://bda.org/news-centre/dental-amalgam-new-regulations-from-1-july-2018