Neurotoxins are used for the treatment of wrinkles caused by facial expressions. Muscle facial expressions can cause frown lines, horizontal forehead lines, and crow’s feet. Neurotoxin treatment is for mild to severe wrinkles. frownLines Neurotoxin is injected into the muscles that contribute to the wrinkles and works by blocking the nerve impulses to the injected muscles. This reduces muscle activity and leads to a reduction of the wrinkles. Treatment can last from 2 to 6 months depending on the location and how often the expressions are being made. Pricing is based per number of units needed for an individual person.