The short answer is of course it is. In addition to brushing your teeth everyday, once in the morning and once at night and getting regular cleanings from your dentist every 6 months, it is important to use mouthwash. Mouthwash helps with cleaning food from your teeth and it helps with bad breath. Companies produce different types of mouthwash, one of which is recommended specifically for orthodontic patients. I recommend going out and finding that in your local drugstore.