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Each whitening gel pen contains 5-8 treatments. Instructions: 1. Twist bottom of pen clockwise until a little gel flows to the bristles.(For your first session, you may need to twist a few times). 2. Smile wide, keeping lips away from your teeth. 3. Use even brush strokes to apply a thin layer of gel to each tooth. 4. Insert beaut. mouthguard & turn on light. 5. After your 15 minute whitening session, rinse with water. gel ingredients: 44% carbamide peroxide