Going without your aligner for a few days is not the “end of the world,” but you will notice a difference when you return. Hopefully, your current aligner still fits fine. If you go a longer period without your Invisalign tray, using it when you return will feel a lot like it did when you first wore it. If an aligner no longer fits at all, you’ve been gone a long time and need to see Dr. Alizadeh in his Carmichael dental office to determine the next step in your orthodontic treatment.