Usually, when people use gel to whiten their teeth, they will use it with a whitening lamp. It can help speed up the time of whitening teeth. The different usage time you see is just the time of the lamp timing.
Typically, when people whiten their teeth with a gel, they use them with whitening lamps. It can help speed up the time to whiten your teeth, and the different times you see are just different when the lights are timed
Usually, when people use gel to whiten teeth, they will use collocation lights together. It can help to speed up the whitening time of teeth. The different use time you see is just the time of lamp timing<br>