Cocaine is an anesthetic and it will numb your gums. Cocaine is actually not a Schedule I controlled substance* like heroin or methamphetamine. It is a Schedule II substance which means it has acceptable medical uses, like as a dental anesthetic, though dentists normally use different anesthetics like benzocaine or lidocaine, or even procaine (novacaine) – notice how they all end in “-caine”.
*under US law
EDIT: Apparently Meth is a Schedule II. My bad.
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