Author's correction note:
Research article Br Dent J 2021; https://doi.org/10.1038/s41415-021-3007-y
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.
