When you say removable braces or dentures, it must be the removable dentures in your mouth. Fitness exercise can be divided into two aspects, 1, which is your own free body activity. 2. With the help of sports equipment, when exercising in these two situations, you must first determine whether your braces or dentures are reasonably designed and well-made. If that's the case, you don't have to take it off when you exercise. Because well-made braces or dentures can play a very good and accurate embedding role in the mouth, it will not cause harm to the gums, but it is best not to shake your head violently, so as not to cause the braces to shift or fall off due to centrifugal force. Generally speaking, you don't need to take off your braces or dentures when you exercise.