Hampstead Heath; hampsteads; ampstids; hamps noun the teeth UK,1887 Rhyming slang, from a rural area of north London.
[T]he rot had set in something horrible with her hampsteads and scotches [the legs], not to mention the boat [the face]. — Derek Raymond (Robin Cook), TheCrustonitsUppers, p. 34, 1962
[B]efore the invention of false hampsteads when everyone spoke funny. — Andrew Nickolds, BacktoBasics, p. 53, 1994