The speed of the tooth whitening effect is also proportional to the concentration of the hydrogen/carbamide peroxide gel and the contact time of the gel with the teeth (see tooth sensitivity FAQ). Increasing the gel concentration and/or increasing the contact time will give whiter teeth faster.
For the quickest and most predictable whitening effect:
1) Professional Scale clean and polish
2) In chair Zoom teeth whitening
3) Custom take home trays