Crest 3D Whitestrips are the default cheap option, but how do they stack up against the dentist on cost over a few years? This is a cost comparison only, not dental advice - your dentist is the right person to say what suits you.
The short answer
A Crest Whitestrips kit runs about $20-$60, versus $150-$600 for dentist take-home trays and $300-$1,000 for in-office Zoom. Strips are by far the lowest entry cost. The catch is cadence: results last roughly 3-6 months, so most people repurchase two to four kits a year.
How the gap narrows over time
Buy two $45 kits a year for five years and you are at about $450 - still well under a $500-plus single Zoom visit, and under most take-home tray totals once you add gel refills. If you whiten four times a year, the running cost climbs faster and the comparison gets closer. Use the calculator above to plug in your own kit price and cycles.
What strips do not capture
Cost is only part of the picture. Professional methods are stronger and last longer per treatment, which can change the per-year math even if the upfront number is higher. Because this is a cost-only tool, it stays out of efficacy and safety - ask a dentist for that.