can you have side affect from dentist novacaine?

Yes

Side_effect
Many dental anesthetics are given via injection. If the needle punctures or nicks a vessel blood can seep and collect below the surface of the skin or the gum tissue. This can lead to swelling. Although painful, hematomas are not considered dangerous. Local anesthetics for dental procedures are designed to numb the nearby tissue. It takes time for these to wear off, you may experience parasthesia
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answered:

Yes

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Side effects to numbing medications can include rapid heartbeat or shaky feeling lasting a few minutes after the infection, soreness where the medication was placed and numbness that takes hours to go away. Contact your dentist if these symptoms seem severe. Try tylenol for soreness and cold foods or cold pack for numbness.
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