A small, hand-held brush that is specifically designed for cleaning dentures.
Dentists recommend that you brush at least once a day to remove food debris and plaque. The best time would be before you go to sleep. When you are done brushing you can soak your teeth overnight in water or a special cleaning solution.
Ideally, you would remove your teeth each time after eating. The reality is this will probably never happen.
A denture brush may have bristles on both sides.
Many people find that using a denture brush is easier and more effective than trying to clean their teeth with a regular toothbrush.