Liz. Invisalign Day 19. I awoke with the same sore throat and the cough that started yesterday has worsened. I didn’t mention that I had two days this week of nausea, and I a little worried it is down the trays or the Retainer Brite. I also felt that I had burnt my tongue yesterday but had not eaten anything hot. I have just researched that Invisalign can cause allergies and I will need to be very vigilant. There seems to be posts on the internet suggested that there is a hypoallergenic option – this has not been offered to me and I would definately have taken it, as I have a number of sensitivities. This morning I felt I just had to get them out of my mouth as fast as possible. I am still coughing and will aim to put them in as off to play tennis and discuss braces progress.