A massive 34,401 photographs of the nation's smiles were shown in the four-day Britain's Biggest Smile exhibition, which finished on Monday at the Royal College of Art in west London.
HP donated 25p to NCH for every photo in the show, which won a Guinness World Record for the world's biggest-ever photography exhibition.
Images were submitted online by the public, prepared for print by ad agency Red Cell and printed on an HP DesignJet 130nr.
HP's Biggest Smile exhibition
There is nothing more beautiful than a happy face, and HP proved it over the long weekend with a record-breaking exhibition that raised almost 10,000 for National Childrens Homes.
