Abstract:
Objective：To study the clinical effects of INFANT TRAINER appliance on malocclusion in primary dentition.
Methods：Ten patients with Class II malocclusion and 8 patients with Class Ⅲ malocclusion were treated with INFANT TRAINER. Overjet and overbite changes and bad oral habit of before and after treatment were observed and analysed.
Results ：Patients who were with INFANT TRAINER compliance had their teeth aligned，deep overjet and deep overbite corrected，and facial profile improved 6 months later．
Conclusion：INFANT TRAINER appliance is effective in treating malocclusion with deep overjet and deep overbite in primary dentition．It is important for doctors and parents to encourage and guide children to wear the appliance correctly and on time.

Key words: malocclusion, INFANT TRAINER, primary dentition period, bad oral habit, children