Some boast that they can whiten your teeth at least three to four shades brighter?
Some boast that they can whiten your teeth at least three to four shades brighter, the main ingredient is baking soda and peroxide; if those are listed on the box then you’ll probably get what you pay for. Some whitening strips do cause teeth sensitivity, I used some and it was too much for me, I’ve opted to stay with the whitening toothpaste.