Hi Gardenia! 😊
Use The Ordinary's Glycolic Acid 7% toner under your arms twice a week in the evenings, only on healthy skin: dampen a cotton pad, gently wipe over the skin, and do not rinse off. Avoid shaving and waxing the same day (wait 24-48 hours), do not use it together with other acids or retinoids, and if no stinging or peeling occurs after two weeks, you can increase usage to a maximum of three times a week. Apply a mild, fragrance-free moisturizer as aftercare and use deodorant only when the skin is completely calm.
Results vary greatly individually, but I would estimate it can take 8-12 weeks before results are visible. Prefer fragrance-free deodorants with less alcohol, and wash and moisturize the skin gently 💕
All the best!