In this study we analyze the factors, which are able to determine the ideal forces for teeth movement and especially canine retraction. These factors are the following: 1. Way of movement. 2. Anatomical situation. 3. Biological situation. 4. Personal factors. 5. Duration of movement. 6. The force control. The analysis of the factors mentioned, proves that there is a variety of "ideal forces" for canine distal movement. Thus, the "ideal forces" differ, depending on: Whether the movement is bodily or tipping. Whether it is applied on cortical or spongy bone. Whether it is applied at early or elder ages. The length of the root. Whether the canine is drawn with or without friction. The orthodontist can approach the "ideal force", considering all the factors mentioned, thus, avoiding experimentation and their following complications.