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., While many kinds of toothpaste can be abrasive and irritating to sensitive teeth, the Crest Pro-health Gum & Sensitivity whitening toothpaste can brighten teeth without any added abrasion or pain., “Whitening strips can deliver much better results since the whitening material is in contact with the teeth much longer than whitening toothpaste,” says Dr. Kourosh Maddahi, founder and CEO of .