Treatment targets the frontalis muscle and involves a number of small injections into the muscle. Your practitioner will inject at a few points along your forehead wrinkles. The total amount will depend on the severity of the wrinkles and size of your forehead. It's also important to note that the amount will vary, depending on which brand of botulinum toxin is used.
Botulinum toxin injections are quick (less than 30 minutes) and relatively painless. Some practitioners will numb the forehead beforehand, so you'll only feel a slight prick of the needle. You may have some slight redness and swelling immediately after treatment, which will calm down after a few hours.
You can discuss how much movement you want to retain in your forehead beforehand; some people like wrinkles to show a little when they raise their eyebrows, while others prefer a completely frozen look.
Results last three to six months, so you will need to invest in regular top-ups if you want ongoing smoothness.