As I mentioned above, tension may make your heart beat faster when you perform a dental injection. When we are nervous, our heart beats faster because our body emits a substance called epinephrine, which increases our blood pressure and causes our heart to race.
Most of the local anesthetics used in American dentistry contain epinephrine (also known as epinephrine). Not only does your body accelerate your heart by releasing adrenaline, but the adrenaline given to you by the dentist is in the local anesthetic!
Don't worry, the dentist doesn't want you to have twice the dose of adrenaline to make you nervous. Another reason is that local anesthetics contain adrenaline: Adrenaline contracts blood vessels.
As the blood vessels shrink, the local anesthetic will stay near the teeth for a long time. In this way, it allows your dentist to spend a lot of time working on your teeth without feeling it. Another reason dentists want vasoconstriction is that only a small amount of local anesthetic is absorbed into the body.
