As much as we’d like for the results of orthodontic treatment to be absolutely permanent, this is unfortunately not the case. Factors such as oral injuries, neglecting to wear your retainer, or grinding your teeth after wearing braces can cause the teeth to drift out of alignment again, which makes them harder to clean and easier to injure. Here’s how people who have already worn braces may be able to benefit from Invisalign and what the process looks like.