Both Invisalign and braces can deal with most cases. Certain situations where there is severe crowding or serious bite issues will need braces and/or traditional appliances instead. Assuming both can treat a given case (example, spacing, crowding, misalignment), usually, it takes around the same time. Key differences include:
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Invisalign needs more compliance. If they are not in your mouth, they are not working!
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Invisalign is clear and therefore much less noticeable than braces.
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Invisalign is typically more comfortable.
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Since they are removable, Invisalign makes it easier to clean your teeth - you can take them out, brush and floss as normal, then put them back in.
In summary, if you are a candidate, Invisalign can often be a better way to go!