What is the per centage of peroxide

Hydrogen Peroxide 9.5%. Compare to 10% for {Professional Effects, Vivid, 1 Hour Express}; total amount of peroxide on each strip also matters.

Can you drink coffee while doing this? Or do you have to give up the yummy caffeine?

I'm afraid it's a bad idea to drink coffee while using the whitestrips. I for instance only use them once a week, but as I can't and don't want to give up coffee, I always brush my teeth right after I've had my last sip (literally!).

This is very individual dependent, but my wife and I did these prior to our wedding and I never went over the recommended time, whereas my wife would routinely go 20 min over. I never had any pain or discomfort; she would frequently mention sensitivity to hot/cold food. That said, her teeth sensitivity went away a week after finishing them.

Must I use all of the pouches in order to see results? Or may I use a few and share the rest with someone else?

I saw results in my teeth after 3 days and even more after a week. If you're happy with your results after a week then you could definitely share.

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Crest 3D Whitestrips, 1 Week Smile Transformation, Whitestrips 3D White, Teeth Whitening Strip Kit, 14 Treatments (Each with 1 Upper/1 Lower), 28 Strips

Crest 3D Whitestrips, 1 Week Smile Transformation, Whitestrips 3D White, Teeth Whitening Strip Kit, 14 Treatments (Each with 1 Upper/1 Lower), 28 Strips

Product ID: 668747

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Details

Brand
Crest
Active Ingredients
hydrogen
Product Benefits
Whitening
Item Form
Strip
Number of Items
28

⏳Removes 15+ years of stains

✨8 levels whiter in 2 weeks

🦷ADA accepted enamel-safe formula

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Description

✨ Flash your brightest smile in just 7 days! 😁

LONG TERM STAIN REMOVAL - Effectively erases over 15 years of tough, set-in stains for a truly fresh look.
SAFE GENTLE ON ENAMEL - American Dental Association accepted formula ensures your teeth stay healthy and strong.
RAPID RESULTS IN JUST 7 DAYS - Experience a visible transformation with 8 levels of whiteness in only one week.
DENTIST GRADE WHITENING POWER - Uses the same professional ingredient trusted by dentists for a confident, radiant smile.
COMPLETE UPPER LOWER COVERAGE - 14 treatments with 28 strips provide full smile coverage for balanced whitening.

Crest 3D Whitestrips deliver dentist-grade whitening with an ADA-accepted, enamel-safe formula that removes over 15 years of stains, achieving up to 8 levels of whiteness in just one week with 14 full treatments.