For OTC numbing gels, I've been using Greencaine (4% lidocaine) gel. It's fairly cheap per ounce and I've had good results. I generally wash up before applying using a surgical prep cleaner (chlorhexidine gluconate 4%, but be darn careful not to get it near your eyes!) with hot water to open pores, let dry, then massage in the numbing gel. I apply a second coat of gel to get the recommended thickness, then cover with plastic wrap. (I apply a narrow strip across the upper lip onto the cheeks, then a big square across the lower lip drawn up to the ears and tucked against the neck. This leaves a mouth hole for speaking. 🙂 )
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