Bleaching may not act on all teeth, for example, if you have gray teeth, bleaching may not be visible, but in the case of yellowish teeth the whitening will work better. But you can make a natural toothpaste for teeth whitening.
1. Mix a little bit of baking soda with toothpaste.
3. Keep this sheet for one hour.
For a visible effect use toothpaste twice a week.
The disadvantages of bleaching so far are not known, but dentists do not recommend too much teeth whitening, and this to avoid damaging the tooth enamel.