Over the counter gels and pens are travel-friendly for quick touch-ups; use exactly to stained areas

https://kylerbqsz130.bearsfanteamshop.com/how-to-whiten-your-teeth-before-a-major-occasion-or-wedding-1

Over the counter gels and pens are travel-friendly for quick touch-ups; use exactly to stained areas and follow directions to prevent gum inflammation.