At what age is it ok for children to begin using deodorant?

7 or 8: At puberty kids will need deodorant. Some children may need it earlier than that. Antibacterial soap may also be helpful. If there are signs of puberty (breasts, pubic hair, rapid growth) under age 8 in girls the patient should see their pediatrician. If there are signs of puberty (testicles larger, pubic hair, acne, rapid growth), under age 9 in boys then patient should see pediatrician.