The internet is full of teeth whitening hacks. Most don't work. Some actively damage your enamel. Here is what the evidence actually says.

Activated charcoal is abrasive and can wear down enamel over time. It removes surface stains, but not intrinsic discolouration, and the trade-off is not worth it.

Over-the-counter whitening strips work reasonably well for mild staining, but results are uneven and sensitivity is common because strips deliver peroxide unevenly across teeth.

Professional in-office whitening remains the gold standard. The concentration is higher, the application is controlled, and a trained hygienist protects your gums throughout the procedure. Results are dramatic, even, and safe when done correctly.

If you are going to whiten at home, ask your dentist for a custom take-home tray. It delivers consistent results without the side effects of generic kits.