The success of your treatment depends on wearing your brace as much as possible. All removable appliances are to be worn full-time unless instructed otherwise. Full-time means virtually 24 hours a day, including eating, sleeping and going to school or work. The only time the brace is to be removed is to clean both your teeth and brace after meals, and during sports and games (including swimming).
The fee for replacement is up to £200 per brace.