This treatment is designed to temporarily relax the frown lines, forehead lines and crow’s feet, lines caused by repeated facial expressions. Other areas that can be injected are neck bands, chin, and masseter muscles (to relax clenching). You will notice a visible smoothing of wrinkles 7 to 10 days after injection. Botox/ Dysport treatment lasts 3 to 4 months, at which time another treatment is appropriate.