The age of the beginning of the fox odor varies from case to case. Hereditary fox odor is present after birth, and acquired fox odor is related to the secretion of sweat glands, which usually begins to appear at the age of 10-14 years during puberty. 1. hereditary bad breath: if hereditary bad breath, and their own genetic expression, after birth will have bad breath, it is recommended to pay attention to hygiene, you can consider laser surgery to eliminate bad breath. 2. Acquired bad breath: If it is acquired bad breath, it is related to the excessive secretion of sweat glands during puberty, and the joint action of sweat and external bacteria, which produces some special smells, and it usually starts to appear around the age of 10-14 during puberty, and you can also consider laser surgery to eliminate bad breath. Fox odor, can go to the hospital in time, follow the doctor’s advice reasonable treatment. Usually pay attention to bathing, change clothes, pay attention to personal hygiene.