Dentists can tell if you use whitening strips by examining your teeth. Whitening strips contain chemicals that can cause changes to the enamel of your teeth, making them appear whiter. These changes can be detected by dentists during a routine dental exam.
There are several reasons why dentists may be able to tell if you are using whitening strips. First, whitening strips can cause your teeth to become more sensitive. This is because the chemicals in whitening strips can irritate the nerves in your teeth. Second, whitening strips can cause your teeth to become more translucent. This is because the chemicals in whitening strips can break down the minerals in your teeth, making them appear more transparent. Third, whitening strips can cause your teeth to become more white. This is the most obvious sign that you are using whitening strips.