Over nine million people used Invisalign in 2020, and of those patients, only 173 reported unfavorable results - none having to do with dental issues (allergy and irritation issues only). With this being said, Invisalign is completely safe for your teeth and is an amazing option for those wanting to straighten their smile without braces. However, do keep in mind that the trays can damage previously placed appliances and can increase the risk for cavities and gum disease if not taken care of properly.