Mostly we observe only irregular teeth / Big teeth / Small teeth/ but never observe the short / narrow or long Jaw. Jaw size can not be increased or decreased after 12 yrs. To accommodate all teeth jaw size must be sufficient. The changes in Jaw we can do by myofunctional appliances. its ideal age is 6 yrs to 12 yrs. before starting this 2 radiographs must needed. 1. OPG 2. Lateral Cephalogram (1:1 Ratio)