Invisalign typically causes less discomfort compared to traditional braces. Traditional braces, with their metal brackets and wires, can cause sores inside the mouth and be uncomfortable when tightened. On the other hand, Invisalign aligners are made from smooth plastic, reducing the likelihood of mouth irritation. However, both options can cause some discomfort, especially when teeth are initially moving or when new aligners are introduced in the case of Invisalign.