Our Teeth whitening serum contains baking soda, xylitol, lemon extract. It can help remove tooth stains, whiten teeth, make your teeth whiter, smile brighter, improve oral health, reduce bad breath, reduce gum inflammation, and make teeth healthier. Its use is simple: take out the serum, turn it on, squeeze the serum onto your toothbrush, or apply it directly to your teeth, brush it the right way for 2-3 minutes, and rinse your mouth with water. And it whitens your teeth.