Although it may be almost impossible to totally remove all plaque build-up, there are some measures that can be taken to keep plaque to a minimum. These include:
Electric Toothbrush. Using a small-headed electric toothbrush is more effective than a toothbrush in cleaning the surfaces and gaps that are obscured by the braces and its attachments.
Interdental Cleaners. Very fine interdental cleaners are an excellent way of cleaning under and around the wire of the braces.
Mouthwash. Rinsing regularly with mouthwash, or even water, is also a good way to remove bacteria and plaque. A dentist may also recommend a fluoride-based mouthwash to help protect against cavities.
Another helpful tool for cleaning teeth while wearing braces is a water flosser which is excellent for removing plaque -- and also helps reduce any gum inflammation caused by the braces.
Your dentist can advise you on which options are most suitable and you can find out more in the article at https://yourdentalhealthresource.com/how-to-fight-plaque-while-wearing-braces/.