You may experience some swelling, minor bruising and tenderness of the underarms, which should subside within a couple of weeks. We recommend avoiding strenuous activity requiring your arms until your symptoms have resolved. Some patients have short-term altered sensation of the underarm skin or upper arms. This will gradually disappear. If any of these side effects occur, we recommend avoiding strenuous activities requiring use of your arms until they have subsided. Aside from getting rid of sweat and odor, miraDry® can also reduce hair growth under the arm.Yes it does help with odor. My results were excellent with one treatment but it was 4-8 weeks of healing