Why Local Anaesthetic May Be Less Effective

Why Local Anaesthetic May Be Less Effective 

If you have ever had dental treatment where the numbness took longer to kick in, you needed additional anaesthetic or it did not last as long as you expected, you are not alone. Local anaesthetic usually works really well, but there are a few reasons it might be less effective for some people.

Here are some common factors that can affect how anaesthetic works:

• Not eating beforehand – low blood sugar can make it harder for the anaesthetic to work properly, so it is best not to come to your appointment on an empty stomach.
• Swelling or infection – when there is inflammation, the area can be swollen or have a change in pH. Both of these factors make it harder for the anaesthetic to reach the nerves and do its job.
• Genetic factors – some people, including those with red hair, may need more anaesthetic or a different type of anaesthetic because of how their body responds.
• Nerve location variation – small differences in nerve anatomy can sometimes affect how well anaesthetic works.
• How your body processes it – everyone’s body is a little different and some people naturally break down anaesthetic faster than others.

We always aim to make you as comfortable as possible, and if you have had trouble with anaesthetic in the past, please let us know. There are different ways we can adjust to make sure you are relaxed and pain-free during your treatment.

Quick tips to help your anaesthetic work better:

• Try to eat a light meal or snack before your appointment – it helps to keep your blood sugar steady.
• Let us know if you are feeling particularly anxious or stressed; we can provide extra support to help you relax.
• Follow any pre-appointment instructions we give you, especially if you are having a longer or more complex procedure.