How Long Does Dentist Local Anesthetic Last?

Local Anesthetic Systemic Toxicity (LAST) Revisited A Paradigm in


Going to the dentist can be a nerve-wracking experience for many people. One of the things that can make the experience less painful is the use of local anesthesia. But how long does local anesthesia last? In this article, we will discuss the duration of local anesthesia and what factors affect its effectiveness.

What is Local Anesthesia?

Local anesthesia is a medication that is injected into the gum to numb the area where the dentist will work. It is commonly used for procedures such as fillings, extractions, and root canals. Local anesthesia is a temporary solution and wears off after a certain period of time.

Factors Affecting Local Anesthesia Duration

The duration of local anesthesia can vary from person to person and depends on several factors. These factors include the type and amount of anesthesia used, the location of the injection, the patient’s metabolism, and the patient’s pain threshold.

How Long Does Local Anesthesia Last?

The duration of local anesthesia can range from 30 minutes to several hours. The most commonly used local anesthesia, lidocaine, typically lasts for around two hours. However, some patients may experience lingering numbness for up to six hours after the procedure.

What to Expect After the Procedure

After the procedure, it is important to avoid eating or drinking until the numbness wears off to prevent accidentally biting your tongue or cheek. You may also experience some swelling or discomfort in the area where the injection was given. This is normal and should subside within a few days.

Alternative Options

For patients who experience anxiety or fear of dental procedures, alternative options such as nitrous oxide or oral sedation may be available. These options can provide a deeper level of relaxation and may help alleviate the fear associated with dental procedures.


Local anesthesia is an effective way to reduce pain during dental procedures. The duration of local anesthesia can vary from person to person and depends on several factors. It is important to follow your dentist’s instructions after the procedure to ensure a speedy recovery. If you have any concerns or questions about local anesthesia, be sure to discuss them with your dentist.