Monsieur J.M. Mallan, a surgeon-dentist from London's Ludgate Hill, 'begs to inform the nobility, gentry and inhabitants of this town and their vicinities that he may be consulted on Mondays at Mrs Swift's, Market Place'. He offers the following: "...to fill the cavities of decayed teeth, however large, with Mineral Saccedaneum, the great advantage of which is that it is placed in the tooth in an almost liquid state, without heat or pressure, and immediately hardens into an enamel which by a recent improvement will not discolour. it allays pain, arrests further progress of decay, thus preventing the necessity of extraction. By this means, a mere shell is converted into a sound and useful tooth, and the unpleasant taint of the breath arising from it entirely removed." What he doesn't say is that 'Mineral Saccedaneum' is almost pure mercury and is most definitely not a nice thing to have in your mouth! (Lincoln, Rutland and Stamford Mercury) Taken from The Peterborough Book of Days by Brian Jones, The History Press, 2014.