Injectable Wrinkle Treatments have now been used in cosmetic medicine for over 20 years. They relax a wrinkle causing muscle, to help improve the appearance of the wrinkle. They are extremely effective in treating crows feet, frown lines and other wrinkles caused by a muscle contraction. They are generally most effective in people aged from 25 -55 years of age. It takes up to ten (10) days to have full effect and can last up to four (4) months.