The short answer is yes, they can fall out. However, if you are able to keep your mouth closed during freefall and use a denture bond it is less likely. Make certain to tell your instructor you have dentures so that if they start to come out and you need to put your hands over your mouth, your instructor doesn’t try and move your hands back into position. You can always take them out for the skydive. If you have video and need to leave them in, we will reasonably work with you any way you need us to to assist you in making sure they stay in.