Cases that have the following conditions can be difficult or impossible to treat with clear aligners:
- Any type, method, or movement indicated as difficult in the case complexity guidelines
- Centric-relation and centric-occlusion discrepancies
- Teeth with short clinical crowns
- Arches with multiple missing teeth
- Patients whose second molars have not yet erupted
- Patients with poor oral hygiene
- Patients with active periodontal disease
- Patients with dental prosthetics or implants
- Patients with severe bruxism
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