This mixture is not healthy for your finger so, don't leave on your finger for more than two minutes.
You can achieve the same result with Hydrogen peroxide
Hydrogen peroxide has a special chemical complex that, when used safely, can remove staining from teeth. In fact, many of the expensive teeth-whitening kits contain hydrogen peroxide as the main active whitening ingredient.
So how does it work?
It's simple! Just brush your teeth with hydrogen peroxide. "Is that all?" You will say. While in a small cup, mix a small amount of toothpaste with hydrogen peroxide and stir until the mixture is completely homogenous. Now you can either add a small quantity onto your toothbrush or dip the brush into the mixture and brush your teeth as usual.
Be extra careful not to swallow the mixture
How to prepare
Get your baking soda and lemon available.
In a clean bowl, add one teaspoon of freshly squeezed lemon juice and one teaspoon of baking soda. Mix the mixture together, and with cotton wool apply this mixture to your teeth and allow to stay for exactly two minutes and rinse off with water. And there you go, your teeth are as shiny as a pearl.
While, no need to worry anymore because you can get shiny teeth in two seconds with just two ingredients that are available at home -Baking Soda Lemon