Urotropine solution contains formaldehyde, which can play a certain bactericidal and antibacterial as well as antiperspirant effect under the acidic condition of large secretion of sweat, and can relieve fox odor to a certain extent. However, because fox odor is generally associated with heredity and prone to recurrence, urotropine solution cannot cure it. Fox odor is mainly influenced by genetic factors and is related to sweat secretion from the sweat glands. If the armpits secrete a large amount of sweat for a long time, bacteria cause fox odor by decomposing organic substances in the sweat and forming short-chain fatty acids and ammonia that have a special odor. When using urotropine solution, it can inhibit the secretion of sweat glands and kill the bacteria in the armpit, so that fox odor can be relieved and reduced. However, after stopping the drug, the function of sweat glands will return to the original level, and the bacteria will re-parasitize and reproduce, and fox odor will come back. Repeated use of urotropine solution will produce drug resistance, while the formaldehyde component in it has a certain degree of toxicity, long-term use may cause allergic, contact dermatitis, toxic effects on the endocrine system, digestive system and kidneys. In addition, people with allergies and poor liver and kidney function are not suitable for long-term use of urotropine solution. Therefore, the use of urotropine solution or other medications alone cannot completely cure fox odor and usually requires a combination of other treatments, such as laser or surgical removal of sweat glands. In addition to treating fox odor by medical means, you should also pay attention to adjusting your diet and improving bad habits in daily life, such as eating less meat and fried foods, avoiding spicy and stimulating foods, and drinking more water. Avoid staying up late for a long time to prevent endocrine disorders. Keep your armpits and other folds clean and dry, change clothes regularly, and use antiperspirant products appropriately.