Braces and Invisalign are two common orthodontic treatments to realign teeth and improve smiles. Braces involve fixed metallic brackets attached to teeth, while Invisalign uses a series of clear, removable aligners. Key factors in choosing a treatment include age, lifestyle, expectations, ability to follow instructions, commitment to wearing the treatment regularly, and cost. Braces require monthly visits but are less likely to be misplaced, while Invisalign requires visits every two weeks but allows removal of aligners. Braces may be more painful initially but are effective for more complex cases, while Invisalign is generally more comfortable but takes longer to complete treatment.