Patchy outcomes typically come from irregular gel application; usage well-fitted trays and avoid overfilling to prevent streaks

https://blogfreely.net/dernesvhbz/how-to-whiten-your-teeth-before-a-major-event-or-wedding-2drn

Patchy results typically originate from uneven gel application; usage well-fitted trays and prevent overfilling to avoid streaks, gum irritation, and squandered item.