While teeth whitening pens are for the most part convenient and easy to use, their effectiveness will vary from manufacturer to manufacturer. They essentially work in the same manner which is that any given pen will release a small amount of product (usually gel) that is applied with a brush-like tip that can be used from tooth to tooth. (This differs from teeth whitening strips where teeth are whitened in sections – usually divided by upper and lower teeth and need to be worn for a period of time.)
The solution in teeth whitening pens typically consists of carbamide peroxide or hydrogen peroxide. Carbamide peroxide is a tooth whitening ingredient that contains hydrogen peroxide but the chemical make-up between the two is slightly different overall. Carbamide peroxide boasts whitening properties but has not been tested enough to be proven safe. Hydrogen Peroxide is found in most teeth whitening products for its tried-and-true results.
It's important to follow manufacturer instructions no matter which whitening pen you choose. Each will carry its own warnings with regards to strength, time needed to take effect, and any tooth sensitivities it may cause.
Most people consider using teeth whitening pens for a quick fix or for a specific tooth, but depending on the type of stain one is hoping to correct, results can vary. If you’re wondering do teeth whitening pens work on crowns, the answer is probably not. That’s because the peroxide found in most teeth whitening solutions do not cause a whitening reaction on the materials used for most tooth restorations.