Invisalign is generally described as causing discomfort or pressure rather than sharp pain. When you switch to a new set of aligners, they are designed to be slightly different from your current tooth positions, which creates a constant, dull ache for the first 48 hours. This sensation is actually a good sign, as it means the trays are actively moving your teeth. Some patients also experience minor irritation or “scratchiness” on their tongue or inner cheeks from the plastic edges, but this usually resolves as the mouth toughens up. Compared to the poking wires and metal brackets of traditional braces, Invisalign is widely considered the more comfortable option. Most of the temporary soreness is easily managed with standard over-the-counter pain relievers taken during those first few days.