It’s a local anesthetic, which means it blocks nerve receptors and basically prevents you from feeling pain in the small areas it is applied to.
I’d imagine it fell out of favor due to negative views surrounding its use and the development of other, more suitable alternatives (but I’m not a doctor).
It is still approved for medical use and is typically used for nose/mouth surgeries due to its absorption and affect on tissue/membranes in those areas.
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