Upkeep matters: utilize a straw for dark drinks, rinse after meals
https://privatebin.net/?c750360cbc6e53f6#A2UuoYjLitsjR1McVwpuz4n9RMW71N87wjPhPeBt2krZ
Maintenance matters: use a straw for dark drinks, rinse after meals, and schedule regular cleansings to protect your whitening results longer.