While in contact with the teeth, the gel releases oxygen free radicals, which whiten teeth over time. Prolonging the contact time delivers the best results. For even better results, you can combine teeth whitening gels with composite bonding or veneers to create a smile any Hollywood A-lister would be proud of. Safe and highly effective, teeth whitening kits from Boutique Whitening include a gel that’s guaranteed to give you brighter, whiter teeth with minimal effort. Choose between day and night kits — depending on the results you’re looking for.