How long local anesthesia lasts in dentistry is a frequent question and depends on several factors. The main factors are the type of anesthetic used, the dose, the location of the injection and the individual response of the patient. Here is some basic information about the duration of anesthesia:
Types of local anesthesia in dentistry
Lidocaine : This is one of the most commonly used local anesthetics in dentistry.
- Onset of action : 2-5 minutes.
- Duration : Usually lasts from 1 to 2 hours for soft tissues and 3 to 4 hours for the tooth.
Artcain : Sometimes used for more complex procedures due to its high efficiency.
- Onset of action : 1-3 minutes.
- Duration : 1 to 3 hours for soft tissues and 3 to 5 hours for the tooth.
Bupivacaine : Used for procedures that require prolonged anesthesia.
- Start of action : 5-10 minutes.
- Duration : 2 to 4 hours for soft tissues and up to 12 hours for the tooth.
Factors affecting how long local anesthesia lasts
- Dose of anesthetic : Higher doses usually result in longer duration of anesthesia.
- Injection location : Anesthesia of nerves that are closer to the surface of the tissue may have a shorter effect than those inserted more deeply.
- Individual response : The patient’s metabolism, age, health status and drug tolerance can affect the duration.
- Use of vasoconstrictors : Anesthetics are often combined with vasoconstrictors (eg, adrenaline) that constrict blood vessels and prolong the effect of anesthesia.
What to expect after anesthesia
- Weakness : After the anesthesia begins to wear off, it is possible to feel weakness in the lips, tongue and soft tissues around the injection site.
- Sensitivity : Some patients may experience sensitivity or mild discomfort as the anesthesia wears off.
- Return of feeling : Full return of feeling may take several hours, depending on the factors mentioned above.
Conclusion
Local anesthesia in dentistry usually lasts 1 to 3 hours for soft tissues and 3 to 5 hours for teeth, depending on the type of anesthetic and other individual factors. If you have specific questions or concerns about your anesthesia, it’s best to talk to your dentist before the procedure.
