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A 27-year-old male asked:

If i have local dental anaesthesia without adrenalin in i can feel pain no matter how much they inject! but with adrenal it works how come?

1 doctor answer • 3 doctors weighed in
Dr. Arnold Malerman
Dr. Arnold Malermananswered
Orthodontics 55 years experience
Local anesthetic: The epinephrine in some local anesthetics constricts blood vessels in the area of the injection, preventing the local anesthetic from being metabolized (broken down) and carried away.
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Dr. Al Hegab
Dr. Norma Jo Waxman
Dr. Al Hegab and another doctor agree2 doctors agree

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