The College of Dentistry at the University of Baghdad has discussed the doctoral thesis entitled (Pulling dental canines using different sizes of brackets: a clinical experiment) submitted by the student Muhammad Nahidh Muhammad Hassan. The study aimed to find out the effect of the dimensions of the different sizes of dental brackets on the rate of movement and rotation of dental canines in addition to the loss of anchorage of the posterior teeth. Also the holes of the brackets and the dimensions of the working of orthodontic archwires were then measured.