Author's correction note:

Research article Br Dent J 2021; https://doi.org/10.1038/s41415-021-3009-9

When this article was initially published the Acknowledgements were not included. The Acknowledgements section should have read:

The authors would like to thank: Julia Radecki, Renu George, Sara Stephens and Varlie Bacon for their assistance with this project.

The journal apologises for any inconvenience caused.