It is possible for Invisalign to cause your mouth to be drier compared to what it normally is which can lead to a growth of bacteria. The growth of bacteria can lead to the development of bad breath. But you can combat bad breath when you wear Invisalign by taking out your aligner while you eat and making sure to brush your teeth before putting the aligner back in. It is important to prioritize your dental hygiene routine to protect yourself from the growth of bacteria.