Dancing en pointe stresses the feet in various ways and thus can potentially cause injuries if the dancer does not plan ahead or take into account health and safety concerns. Injuries can result from improper technique, poorly fitting pointe shoes, and lack of effective cushioning and accessories. Some types of injuries are prevented by adhering to proper technique such as: correct upper-body positioning, maintaining straight knees when required, keeping body weight centered over the box of the shoes, and avoiding sickling. Problems dealing with technique can be easily fixed by proper training and one-on-one interactions with the dance instructor to improve the dancer's technique.