Side Effects Novocaine -

Sometimes the injection hits the facial nerve by accident. You might find you cannot blink one eye or smile on one side. Do not panic. This is not a stroke. It looks scary, but it is just the anesthetic blocking the motor nerves. It wears off in 1 to 3 hours.

True allergic reactions to Novocaine are extremely rare (less than 1% of people), but they do happen. You should seek medical attention if you experience: side effects novocaine

The following side effects are common and usually temporary: Sometimes the injection hits the facial nerve by accident