From my experience treating patients, warts can be incredibly persistent and what works for one person might not work for another. The over-the-counter treatments can take several months to show results and they don't always penetrate deep enough, especially if the warts are thick or in areas with tougher skin. Cryotherapy, which is the freezing method your doctor mentioned, is effective but it usually requires multiple sessions and can be uncomfortable. There are actually several professional treatment options beyond just freezing that you might want to explore. Some dermatology clinics offer different approaches depending on the size, location, and stubbornness of the warts. The key is finding a treatment that addresses the root of the problem rather than just the surface.