What is the difference between braces and clear aligners?

Braces are often metal and are permanently attached, they work continuously without relying on patient memory or discipline. Braces are ideal for severe crowding, significant bite discrepancies (overbite/underbite), or rotated teeth. Clear aligners are custom-made, transparent plastic trays used to gradually straighten teeth you replace each aligner with the next in the series, your teeth will move – little by little, week by week – until they have straightened to their final positions. a You must wear them 20 to 22 hours a day; forgetting to wear them will stall your progress