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A 46-year-old member asked:

I will be in a dental surgery of two hours, how long does the effect of a local anesthetic?

2 doctor answers4 doctors weighed in
Dr. Charles Coleman
Dentistry 25 years experience
1/12 to 3 hrs: The lifespan of the strongest anesthetic.3 hours.But usually less than 2 hrs.
Dr. Gary Sandler
Dentistry 54 years experience
Local anesthetics: Local anesthesia normally lasts from 30 minutes to 4 hours. This depends upon which local anesthetics are used, whether it is an infiltration or block injection and your own metabolism. There are some long acting local anesthetics that last up to 12 hours.

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A 44-year-old member asked:

Can you tell me in a dental surgery of two hours, how long does the effect of a local anesthetic?

1 doctor answer2 doctors weighed in
Dr. Arnold Malerman
Orthodontics 53 years experience
At least: Local anesthetic will last as long as necessary to complete your treatment and for a period of time after. Dentists have different local anesthetics to choose from, and will pick the appropriate one for your procedure.

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Last updated Jan 2, 2014

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