Align with gum line and press lightly for good contact. Fold in the rest of the back of the strip so it stays in placeTeeth whitening strips use innovative active oxygen tooth whitening technology. Effectively protects and whitens teeth. There are 7 trial packs and 14 full packs for you to choose from. Quick whitening sticker in less than 30 minutes a day to make your smile more attractive Effectively removes years of stubborn coffee-related stains Reduces tooth sensitivity and removes stains Anti-slip teeth strips With a strong sticky formula, the strips are easy to stick and tear away Improves yellowing of teeth. Our teeth whitening strips safely and effectively remove stains from food, coffee, wine, soda, smoking. Use 1 set of 1 hour daily for brighter, whiter teeth in just a few days. 1. Peel off, 2. Paste for 30 minutes, 3. Uncover and brush. Just 3 steps to actively remove stains and make your smile instantly bloomNote: 1. Do not brush your teeth before use. 2 Brush or rinse your teeth after use. Do not eat, smoke or drink immediately after applying the sticker.3. Whitening strips will only whiten natural teeth. This product will not whiten crowns, crowns, veneers, fillings or dentures, etc. If you have dental work or medication stains, consult your dentist to determine if whitening is suitable. 4. Do not use while wearing the stand. 5. Use up to 2 sets per year