There is really no need to boil a razor. If you must, the best thing to do is bring the water to a rolling boil. Once it reaches that point, remove it from the heat, place the razor in the heated water and leave it set for 5 minutes. The water is sufficiently heated at that point to kill whatever may be on the razor.
I wonder if everyone were to consider how many times metal utensils at a restaurant are used on a daily basis, namely, fork, spoons and knives. How many of those items are placed into many different mouths over a course of a day and how many of those same mouths have cold sores, canker sores, open wounds (because I'm certain, we've all inadvertently bit our tongue or cheek before), etc? Those utensils go into a dishwasher in which the temperature has to be over 180 deg F to effectively clean and sterilize the utensil for the next customer. Once run through the washer, they are handled by the waitstaff, sorted and placed into a plastic container or wrapped into a napkin, etc.
I think there is a certain phobia associated with razors and sterilization. Scrubbing bubbles, Barbicide, ultrasonic cleaners, hot water is more than enough to get rid of pathogens on a razor.
There is no need to boil a razor.
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