A recurrent dream is a dream which seems to occur over and over again. Some of these dreams are shared by many people, such as losing all of your teeth at once (see typical dream), while others are unique to an individual. However, although it might seem that a recurrent dream occurs the same way each time, in reality this is usually not the case, other than under extreme circumstances, such as in Post-Traumatic Stress Disorder dreams). Usually at least some aspect of the recurrent dream will change each time. As well as recurrent dreams, recurrent dream themes can be experienced, in which the dream is very different every time, but the theme repeats. Recurrent dreams and recurrent dream themes often relate to some kind of unresolved issue. When the issue is resolved, the dreams stop.