Invisalign Final Retainer - Bad for my Teeth to Only Wear It at Night?

After Invisalign, a retainer must be worn, at least at night, for as long as you don't want teeth to move, which is probably the rest of your life.  Whereing a retainer the same as aligners to let the bone harden around the teeth is a good idea.  The teeth may need to be occlusally adjusted as the way they originally fit together and the way they were worn is different then the way they now come together post Invisalign.  Talk to your provider and have him check your bite.  Good luck! 

It is very important to wear your retainers each and every night.  There will be forever a tendency for your teeth to relapse back to where they were before invisalign.  Physiologically, teeth tend to move throughout your lifetime.  It is important to have the retainers maintained and checked regularly.  Depending on the type of retainer they may need to be replaced every so often.  Retainers wear out and when they wear out they no longer hold your teeth properly.