Dental anesthesia is used to numb the pain in a local site for a dental procedure to be done without pain or discomfort. Since it is only local anesthesia, are there side effects of dental anesthesia injection?
Any kind of anesthesia will have some sort of side-effect, some may be long term and the others only short term. Be sure to report any of the side-effects you might be experiencing to your dentist so that they can advise you about them.
Most of the time, the side effects would disappear after the anesthesia wears off.
What are the side 
effects?
The inability to blink. Anesthesia makes you unable to feel pain, but the inability to move your muscles normally also accompanies this. If you find yourself unable to blink, your dentist can close your eyelids for you until the sensation returns, to prevent your eyes from drying out.
Droopy eyelids are also a common side effect.
Accelerated heart rate. You may experience a quickening in your heart rate for around one to two minutes, because of the vasoconstrictor drug in the anesthesia. Tell your dentist about it if you feel this.
Hematoma. If the needle hits a blood vessel during the administration of the anesthesia, hematoma, or a blood-filled swelling may occur.
Nerve damage. If the needle strikes a nerve, you may experience numbness in the area for a few weeks to a few months. This type of damage happens very rarely, but it still does happen occasionally.
The most effective way to avoid needing any dental anesthesia would be to keep your teeth and gums in tip-top shape. Good oral health will reduce the need for you to undergo any corrective and preventive procedures with your dentist, also reducing the need for you to be exposed to any dental anesthetic.
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