The exact length of time that a Foxit injection lasts varies from person to person and cannot be generalized. Generally speaking, most patients can maintain 6~9 months or longer; individual patients may only maintain 1~2 months. 1. Fox injection usually refers to the injection of botulinum toxin type A in the armpits to eliminate armpit odor by reducing the secretion of sweat by the small sweat glands. In general, most patients with one injection, the effect can last 6~9 months or even longer, however, there are individual patients with poor results after the drug, the duration of the effect can only last 1~2 months, the specific maintenance time, vary from person to person. 2. Fox odor injections may cause local skin swelling, bruising, erythema, pain, triggering cold-like symptoms, headache and nausea, itchy rash and other adverse reactions, these symptoms are usually mild, most patients can be self-healing within a week. This injection is contraindicated in patients with infection in the armpit, pregnant women, lactating women, allergy to botulinum toxin type A, and patients with major systemic diseases. It is recommended that patients who want to have a deodorant injection go to a regular hospital to be operated and treated by a professional doctor.