Injecting local anaesthetics can become routine for dental practitioners because of the high efficacy and wide safety margin of these products. Nonetheless, there are instances when these drugs do not work or when they must be used with caution. This section has attempted to highlight important issues about local anaesthetic use to aid practitioners in making their local anaesthesia practice as effective and as safe as possible.
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On completion of this module you will be able to explain the anatomy and nerve supply of the teeth, discuss factors different local anaesthetic techniques, and recognise reasons for failure of anaesthesia.