Author's correction note:

Letter Br Dent J 2020; 229: 3.

When this article was published R. Suffern was omitted from the author list. The author list should have read:

R. Smith, A. Panchal, R. Suffern, I. Politi, M. Barker, T. Pepper, and F. Ryba.

This has been corrected online.

The authors apologise for any inconvenience caused.