Some studies suggest that bleaching can lead to tooth sensitivity . However, this only applies to aggressive bleaching methods. Examples of aggressive bleaching methods include power bleaching, where high concentrations of hydrogen peroxide (30 to 50%) are used to whiten teeth. 5 Teeth whitening pens work by releasing a serum that coats your teeth to remove surface stains and dark spots. Your teeth can lose their natural pearly color for several reasons: Most effective over-the-counter (OTC) teeth whitening products contain hydrogen or carbamide peroxide. These are peroxide-based bleaches that act directly on teeth stains. Some teeth whitening pens can be cheap, but they only contain a small amount of product. However, other pens can be more expensive but contain more serum. This means you’ll get more value for your money when using them. Brand Reputation

While teeth whitening pens are typically a shorter-term solution, they can also work well if you want longer-lasting, overnight application without the fuss of an LED mouthpiece or whitening trays. Enter the Colgate Optic White Overnight Whitening Pen, designed specifically as a more effective, longer-term solution to whitening. Plus, this pen has one of the highest applications available, with more than 35 treatments available in one pen.

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For reasons of hygiene and safety, personal grooming products, cosmetics or items of intimate clothing cannot be returned. You can also use the PAP-X Pro White Teeth Whitening Pen whenever you feel like your teeth need a touch-up.

Treatment with a teeth whitening pen usually lasts for 7 to 10 days. You will continue to see visible effects throughout the process. How Often Should You Use Whitening Pens? If you’re looking for a whitening treatment that falls between committing to an hour-long LED treatment and a standard whitening pen, combining the two might be just what you want. Colgate SuperNova offers the results of a full whitening treatment with a shorter application. LED treatments work by breaking down peroxide faster, leading to whiter teeth sooner. Over-the-Counter Tooth Whitening Agents: A Review of Literature . ” Scientific Electronic Library Online Brazil.However, if you see PAP (or phthalimido-peroxy-caproic acid) on the ingredient label, steer clear. The dentists we spoke to said this ingredient is not recommended for whitening at all due to reports of lingering sensitivity. Hydrogen peroxide, when used correctly as a whitening agent, shouldn't cause lingering sensitivity. A clinical evaluation of carbamide peroxide and hydrogen peroxide whitening agents during daytime use . ” PubMed.

On the other hand, hydrogen peroxide breaks down faster than carbamide peroxide and lightens stains in as little as 30 to 60 minutes. But it doesn’t produce much effect until the next application. 2 Teeth whitening pens work the same way as other whitening products, but they use a serum to apply whitening ingredients to your teeth. Most teeth whitening pens use a peroxide formulation—either hydrogen or carbamide—to break down stains. “Peroxide gels break down into water, oxygen, and reactive oxygen molecules,” explains Dr. Velayo. “These reactive oxygen molecules treat both the enamel and the dentin, oxidizing the bonds of discolored stain molecules. By changing the stained molecules, the tooth becomes lighter.” NewMouth is a leading and trusted online resource for dental information, including product recommendations, primary dental care, at-home oral health care, orthodontics, procedures, costs, and more. Dr Hanna Kinsella, cosmetic dentist and founder of Icy Bear Dental, explains: "Hydrogen peroxide is a weak acid with strong oxidising properties, meaning it steals the electrons that hold the staining molecules together, causing them to fall apart. It will change the colour of your teeth, rather than simply removing surface stains. Carbamide peroxide is another similar ingredient."

Warnings

Per Dr. Kalasho, common whitening ingredients that work well for at-home use are carbamide peroxide and hydrogen peroxide. For carbamide peroxide, look for a percent of around 35 percent; for hydrogen peroxide, you’ll want something with a 10 to 15 percent concentration. Teeth whitening pens are convenient and affordable for those looking to whiten their teeth without needing professional treatments. These pens contain safe and non-abrasive ingredients to help you achieve a brighter smile. Colgate Optic White Pro Series Teeth Whitening Pen and LED Tray: If you’re short on time, this kit only requires 10 minutes per day, but it’s not the most comfortable after application (and it’s more expensive than similar kits).