I am less worried about a normal box of strips than I am about the person who stacks strips, whitening paste, acidic drinks, and hard brushing in the same week. Teeth are sturdy, not invincible.
So what is the honest answer?
Used as directed, peroxide strips are generally considered safe for enamel, but overuse is where people get into trouble.
Peroxide changes stain molecules inside the tooth surface. It is not supposed to sand enamel away. The problems usually come from wearing strips too long, repeating cycles too often, or letting gel sit on irritated gums.
The part people usually miss
Follow the wear time, take breaks, and keep fluoride in the routine. If you see chalky spots, feel sharp sensitivity, or have recession, ask a dentist before another round.
My rule is boring and useful: change one thing, watch what happens, and stop if your mouth gets irritated. Teeth respond better to steady habits than to panic routines before weddings, photos, or dentist appointments.
How I would handle it this week
- Take a baseline photo in bathroom lighting you can repeat.
- Keep brushing gentle at the gumline, soft bristles only.
- Do not stack three new products at once, because then you cannot tell what helped or hurt.
Related reading: this guide and this review or article both go deeper on the practical side.