Malic acid or vinegar
This bleaching option should be used carefully because of the rather aggressive components. The most extreme way – vinegar rinses, but they are unpleasant in taste. After the procedure, vinegar must be spat out and rinsed thoroughly with water. Like lemon, you can add soda to vinegar.
The resulting mixture is applied to the teeth and left for 5-10 minutes, then, as a rule, rinse your mouth and brush your teeth.