2. Preliminary Studies We conducted a randomized clinical study with an early headgear treatment, where the control group was treated with a camouflage treatment in the adolescence. The main difference between the groups was broader dental arch with less extractions in the headgear group, the differences between the groups being relatively small when the craniofacial differences or the stability are concerned (Mäntysaari et al.,2004; Pirttiniemi et al.,2005; Krusinskiene et al., 2008). There were, however, some distinct profile differences between the groups and the canine eruption pattern was found to be more favorable in the early headgear group (Silvola et al., 2008; Virkkula et al., 2008).