17 Crest 3D White stips

17/20 Crest 3D white strips. I think these are great but, not for my lifestyle and habits I'd have to immediately drop for optimal success. I've used 3. 17 left. Cost $69. I believe this is level 18. Pick up Ossington or dufferin Subway Product details: 20 Treatments kit (40 Strips: 20 upper/20 lower). 11% Hydrogen Peroxide removes over 15 years of stains. Up to 20 levels whiter in 3 weeks. Features AdvancedSEAL™ No Slip Technology. 45 minute wear time, for 20 days. Cheers Mac