Send your letters to the Editor, British Dental Journal, 64 Wimpole Street, London, W1G 8YS. email@example.com. Priority will be given to letters less than 500 words long. Authors must sign the letter, which may be edited for reasons of space. Readers may now comment on letters via the BDJ website (www.bdj.co.uk). A 'Readers' Comments' section appears at the end of the full text of each letter online.