Liz. Invisalign still out. Day 26.  Coughed through the night and left exhausted so no teeth or tennis for me today. I did however meet the tennis girls for lunch and review our teeth progress, at the moment we are quite obsessive on our subject. I am feeling quite demoralized when I see the excellent progress being made around me and I am getting nowhere.  I am wondering if this is allergy, sensitivity or infection or a combination of them all.  I am seriously wondering if I could stomach lingual braces, and what the duration of that would be compared to Invisalign. Hopefully tomorrow my dentist will have had a response back from America. My doctor said to go and see her if no improvement by tomorrow and so I may go and see what she thinks.