There are very few cons when it comes to straightening teeth with Invisalign clear aligners. That said, they may not be suitable for everyone. The aligners may be less effective than some other types of braces for complex orthodontic issues. Invisalign also requires compliance, given that they can be removed for a portion of the day. For people who are prone to losing things or are worried that they may forget to wear the aligners for sufficient time each day, they may not be the best choice.