Most patients find that the first week of Invisalign is the most challenging part of the entire journey. During these initial seven days, your mouth is adjusting to the constant presence of foreign plastic against your gums, tongue, and cheeks, which can cause minor irritation or “dry mouth.” You will also experience the peak of tooth soreness as the first set of trays begins the initial movement of your dental arches. Besides, the lifestyle shift becomes very apparent during this week. Learning how to discreetly remove the trays, carrying a travel toothbrush everywhere, and resisting the urge to snack become significant mental hurdle. Once you establish a routine and your mouth toughens up, the next few weeks usually feel much more manageable.