The brain is the most important organ in the body. The brain not only controls movement, speech, and sensitivity, it is also responsible for thought, intellect, moods, and memory. When the brain begins to deteriorate it can affect the function of various parts of the body, ultimately affecting the patient’s daily, social and work life, as well as the people around them. Dementia describes a decline in mental activity that is severe enough to affect a patient’s daily life.