Here are some general guidelines on how often to use the Banisher depending on the version you have
Banisher Roller or Banisher Stamp 1.0 - Use once every 2 weeks.
You can use it up to once a week if your skin is not sensitive.
Banisher 2.0 - Use once a week.
The Vitamin C Serum that comes in a kit can be applied daily for best results.
If you have sensitive skin, or it is your first time trying the Banisher then it is recommended that you test on a small area of skin and wait 24 hours to see how your skin reacts.