How does BOTOX® Cosmetic work?

Botox® Cosmetic relaxes the contraction of muscles by blocking nerve impulses so that muscles (that cause wrinkles) can no longer contract. As a result, the wrinkles relax and soften. After treatment, the facial skin remains smooth and unwrinkled, while the untreated facial muscles contract normally, thus allowing your normal facial expression to remain unaffected. The entire process usually takes two to four days for cosmetic improvement, and the effects last from four to six months. Most patients require retreatment as the wrinkles and lines begin to reappear; however, after each injection the wrinkles tend to return less severely.