How many shades whiter, realistically.
The kit says 6 shades. The mirror says 2. Why marketing numbers and your actual result diverge — and what to expect.
Photo: Tima Miroshnichenko / PexelsEvery whitening box says up to 6 shades whiter. The phrase up to is doing a lot of work.
The scale
Dentists rate tooth colour on the VITA Classical shade guide — a 16-step scale from B1 (lightest) to C4 (darkest), with values mixing along the way. Most adults start somewhere in the A2–A3.5 range.
A single shade gap is small in measurement, larger in perception. Two shades is the photo-noticeable threshold for most people. Four is striking.
What "up to 6" actually means
The number on the box is the best-case observed in trials — usually healthy enamel, no extrinsic stain build, perfect protocol, no coffee during the run. Population-average results from at-home strips at 6% hydrogen peroxide over 14 days:
- Mean lift: 3–4 shades
- Upper quartile: 5–6 shades (the people the marketing photo is built around)
- Lower quartile: 2 shades
Everyone underestimates which group they're in.
What predicts a strong response
- Younger enamel (more translucent — peroxide hits dentin more visibly)
- Recent dental cleaning (no tartar/pellicle to chew through)
- Strong extrinsic stain base (more "wow" between day 0 and day 14)
- Discipline during the run (no coffee/wine/curry — or water in between)
What predicts a weak response
- Very translucent edges (the front teeth read a colour from the dentin behind, not enamel — limit hit early)
- Existing internal tetracycline staining (peroxide does little)
- Heavy coffee continued during the run
- Less than 25 minutes of contact per session
The honest number for a coffee-drinking adult on a 14-day at-home course is 3 to 4 shades. Five is a good run. Six is a marketing photo.
How to measure your own result
Take a photograph against a white wall, neutral light, day 0 / day 7 / day 14 / day 28. The shade stabilizes 7–14 days after the last session — the day-14 photo is not the final answer. The day-28 one is.
Day 14 with little visible change usually means three things: extrinsic stain wasn't removed first (need a cleaning), wear time was under 25 min, or the underlying dentin is naturally darker than expected. Plan a re-touch course in 6 weeks rather than continuing.
Three to four shades is a real win.
More: what to know before whitening at home.
Disclaimer. Editorial, not medical advice. Individual results vary.