Irregular results typically originate from irregular gel application; usage well-fitted trays and avoid overfilling to prevent streaks

https://andersonwmsf170.yousher.com/the-length-of-time-does-teeth-whitening-last-a-practical-timeline

Patchy results often come from irregular gel application; usage well-fitted trays and prevent overfilling to prevent streaks, gum irritation, and lost product.