The internet is flooded with DIY whitening materials such as activated charcoal, apple cider vinegar, baking soda, etc that can be used to whiten teeth. These materials have the potential to cause serious damage to your teeth and gums, which can be costly to fix.
Some hazards of DIY teeth whitening are mouth ulcers, gum irritation, increased tooth sensitivity, tooth erosion, tooth abrasion, and even gastric upset.
If your teeth are stained or darker than you would like, see a dentist who can assess your teeth and provide you with appropriate and safe options to achieve the teeth whitening results you want.