Sir, I would like to inform your readers of a simple solution to the irksome problem of leaking local anaesthetic cartridges used in dental syringes.

Leaking cartridges do not only delay procedures and annoy the patient – as the solution runs into their mouth or down their chin – but does not allow for an accurate record of the amount of local anaesthetic administered.

If the cartridge is found to be leaking, replace the cartridge in the syringe but ensuring the end of the needle penetrates the centre of the bung of the cartridge, rather than towards the periphery.

It is this peripheral oblique placement that prevents a satisfactory seal from being achieved and allows leakage to occur.