âEffective whitening ingredients-Seurico tooth whitening pen stands out for its dual-action whiteningformula, using both sodium phytate and xylitol to effectively remove surface stains and break down stubborn, deep-set stains in the enamel. Clinical studies have shown that our dual-action formula is up to50%more effective than single-ingredient formulas in whitening teeth. âEnamel-Safe Formula While some tooth whitening products can damage enamel and cause tooth sensitivity, our product features an enamel-safe formula that is gentle yet effective. Our formula ispH-balancedand contains ingredients that promote healthy teeth and gums, such as fluoride and xylitol. âLong-Lasting Results-Seurico tooth whitening pen provides long-lasting results, unlike other products with only temporary whitening effects. It contains stain-preventing ingredients, ensuring your teeth stay whiter for up to6 monthsafter use.