And if so, why do people spend so much money on teeth-whitening products when they could get a tub of baking soda for around 50p? Also, is it safe to use in this way?
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It does and it is safe to use - just rinse well. After all, baking soda is used in baking! It's our "use no initiative" society, we prefer to have someone hand us a ready-made product.
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