Brushing after every meal, or 3 times per day, is highly recommended when going through braces or clear aligner treatment.
Use a fluoridated toothpaste and even tooth mousse to aid in strengthening the teeth.
Try to clean between the teeth as best you can, either with orthodontic floss or interdental brushes.
Avoid sugary/sticky foods as much as possible.
Keep on top of your routine dental check up and cleans.