Stage 1 (D1): Soft Hardness: Soft Duration: Approximately 1-2 months Purpose: Requires a few minutes to adjust upon first use. Wear for 12 hours daily for initial orthodontic adjustment and adaptation.Stage 2 (D2): Medium Elasticity and Hardness Hardness: Medium Duration: 2-3 months Purpose: Suitable for mild to moderate malocclusion. Can be used directly for further adjustment and correction.Stage 3 (D3): Harder Material Hardness: Hard Duration: 3-6 months Purpose: Used for further orthodontic treatment or as a retainer to restrict tooth movement and ensure orthodontic results.Product Features Safe Material: Made of food-grade TPE material, non-toxic and odorless, soft and elastic, suitable for various users. Advanced Technology: Utilizes polymer nanotechnology, providing excellent resilience and significant orthodontic results. Invisible Braces: No wires or brackets required, invisible braces give you a confident smile. Convenient to Use: Easy to put on and take off, compact and portable.Packaging Contents Includes 1/3 x braces, divided into three stages. Each stage's aligners are carefully designed to meet the needs of different stages of treatment.Packaging Dimensions Three-Stage Packaging: Each stage's box measures 9cm x 8.5cm x 3.8cm. Overall Box: The overall box measures 95mm x 85mm x 70mm for easy storage and portability.Through these three stages of gradual correction, you can expect to achieve straighter and more beautiful teeth.