Firstly, Invisalign cleaning is a hot topic. Invisalign is the most commonly used brand of clear aligners. For those who start wearing Invisalign aligners, they think that nothing wrong can happen to change the appearance of the clear trays. However, after wearing their trays for 1-2 weeks, they do tend to discolor and show mild wear. You will also notice that the same tartar or dental plaque that accumulates on the teeth will start to build upon the aligners. A good orthodontist will show you how to take care of the aligners and minimize these situations.