IRCT20200707048046N1 IRCT 2021-01-19 Islamic Azad University Effect of lip exercise with activator headgear on the inter labial gap on class II division 1 and long face patients Effect of lip exercise with activator headgear on the inter labial gap on class II division 1 and long face patients 2021-01-20 anticipated 30 Complete https://irct.ir/trial/49572 interventional Randomization: Not randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Blinding description: Samples that were entered into the intervention group according to the lottery will receive instructions on how to perform lip exercises without informing the other participants. Also, the person who analyzes the data will analyze the information without knowing the grouping of people and every person in each group. N/A Orthodontic. Intervention 1: Control group: receiving orthodontic appliance, activator high pull headgear and using it for 14 hours during the day. Intervention 2: Intervention group: Receiving orthodontic appliance along with the upper lip exercises so that it takes the upper lip with 4 fingers from the outside and the thumb from the inside and pulls it down for 20 seconds. Perform this exercise 3times a day and 5times each time. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is There is no more information