Features: 【Rapid Whitenings Effect】The unique gel layer of the whitenings strips penetrates the tooth surfaces quickly, effectively removing stubborn stain. 【Gentle and Not-Irritating】Formulated with a mild formulated that does not damage tooth part, minimising the risk of sensitivity. 【Convenient Use】Slim design conforms to tooth contourings for effortless application without complex procedures. 【Long-Lasting Freshener Breath】Beyond whitenings, the strips help freshen breath for sustained breath freshness. 【Eco-Friendly Safe】Crafted from highly quality, friendly to environment that meet international safety standards. Specifications: Component: gel layer Single Size: about 9x8.3cm/3.54x3.27in Standard size fits most tooth shapes Attributes: 7 pairs of 14 stickers/14 pairs of 28 stickers/21 pairs of 42 stickers/21 pairs of 42 stickers + 1 expander,4 specifications Optional Technical parameters: Fast dissolving formulated | Mild and not-irritating | Not peroxide ingredients Usage scenario: for Daily teeth whitenings care｜Quickly improve teeth whitenings before important occasions Package Includes: 1Set Whitenings dry tooth strips note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.