Toothpaste should not be used to treat foot fungus at all, because foot fungus is a fungal infection causing tinea pedis and toothpaste has no antifungal effect. On the contrary, some people are allergic to the mechanism of toothpaste, which may also cause local allergic reactions. Treatment of foot fungus can begin with a fungal test, and after a clear diagnosis, you can take oral terbinafine hydrochloride tablets, two capsules every night, or itraconazole capsules, two capsules a night for oral treatment. At the same time with terbinafine hydrochloride gel, or luliconazole ointment to apply, the treatment cycle is about half a month to a month. If nail fungus is caused by a fungal infection of the feet secondary to foot fungus, it is also treated with the above mentioned medications, but the treatment period is longer, which may take about three months to six months. During the treatment period, it is important to keep the affected area ventilated and not too hot and humid to avoid fungal growth.