Nowadays, we see celebrities advertising tools to beautify their teeth instantly, such as Whitelight (teeth whitener) or retainer (gear). These tools are claimed to be able to make white and neat teeth quickly, cheaply, and easily, just by sticking to the teeth. Advertisements for tools to beautify teeth are widely spread on social media such as Instagram and Facebook and are also sold on online shopping platforms. In most of statements of the ads, the seller always claims that the tool can fix all dental problems such as messy teeth and it can whiten without having to bother visiting the dentist. Inaccurate use of the device as in the gear might have dangers to the teeth health. Typically, dentists refer to the device as a retainer, but such objects are then sold as “magic gear”.

The retainer is actually used when dental care with stirrup has been completed. The goal …