Hi and welcome Carolina!
Invisalign treat both arches and I'm not sure if you'd be able to find a quality provider who'd treat just one arch for this reason. It's important to consider both arches when treating teeth, as often to fix alignment, both arches are affected, as the bite is changed. For example as the gaps in your teeth in your upper arch close, your teeth may no longer meet with your lowers, without some adjustments to them.
If your bonded retainer was bonded correctly and you were also wearing your removable retainers for at least three nights a week, your gaps should not have reopened. If some part (any part) of your bonded retainer was no longer attached and you had become slack with your removable retainers, gaps would easily open again. Bonded retainers are great for keeping gaps closed, but you need to check them weekly to make sure they remained bonded in the same way they were put on. Plus the removable retainers are for life and need to be worn for three nights a week, once full time wear is reduced.
Please have your questions ready for your ortho at your next appointment ... write them down if you think you might forget them (this works well for me).
Good luck with your treatment!![]()


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