Aligner treatment category IV is the most comprehensive level of clear aligner therapy, intended for patients with severe misalignment, major spacing or crowding, and complex bite disorders. These cases require advanced planning and continuous professional monitoring.

Treatment is based on detailed digital analysis and customized aligner sequences, often combined with additional orthodontic techniques to achieve optimal results. Despite the complexity, aligners remain transparent and removable, allowing improved comfort and aesthetics throughout treatment. Category IV aligner therapy aims to restore proper alignment, bite function, and long-term oral health in challenging orthodontic cases.