It is very important to take your aligners and the next set(s) with you on a trip. If you interrupt your treatment your teeth will shift back to their old position so the result you have achieved will get lost. You always get several sets of aligners to take home, so you can go on a trip with peace of mind. If you go by plane, be sure you put all your sets of aligners in your handluggage to make sure they won't get lost!