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Understand how to freeze a wart. Over-the-counter cold kits use dimethyl ether and propane to freeze the wart and the tissue around the wart. Realize that the wart will not instantly fall off after treatment. It may take several treatments and up to 3 or 4 weeks before the wart gradually disappears.
Freeze only for very short contact times. â¢ It is very important that you only freeze the wart or verruca for a matter of seconds. â¢ The precise number of seconds required depends on the size and location of the. wart or verruca you are treating; â¢ larger warts take a little longer to freeze to the core;