Gel Kits: If you’re looking for a dedicated treatment that’ll net you higher-level whitening results, try a gel kit. Dr. Velayo suggests trying a kit with about 10 to 15 percent hydrogen peroxide, which should give you noticeable results in just a couple of treatments.Whitening Strips: As Dr. Velayo previously told Health, whitening strips are also one of the most effective whitening treatments because of their application and ingredients. “Whitening strips that have a higher peroxide concentration, plus have the added benefit of increased wear interaction between the teeth and ingredients, are the most effective products,” she says.The other options: But if you’re looking for a more convenient option, teeth whitening pens and toothpastes are easy to take on the go or use daily—they’ll just take a little longer for full results., Looking for the best whitening toothpaste? We tested teeth-whitening toothpastes and spoke to dentists to find the best ADA-accepted formulas that quickly reveal a whiter smile and remove plaque., Sensodyne Pronamel Gentle Whitening Toothpaste is an excellent choice for those with sensitive teeth looking for a daily toothpaste that offers gentle whitening and enamel protection. Its fluoride content helps prevent cavities, while its SLS-free formula ensures a gentle brushing experience. Users have noted its effectiveness in relieving sensitivity and maintaining overall oral health..