Liz. Invisalign Day 20. Today was a tough day, I coughed a dry stratchy cough from dawn until dusk, and as my voice began to fail me, I decided to email my dentist with my worries. I am sure it is a reaction to either the trays or the Retainer Brite. During the afternoon it was so bad, I took out the bottom tray which gave me almost instant relief. Right now I feel disappointed and worried about the implications are. My dentist was quick to respond to my concerns and told me to stop immediately wearing the trays that had been soaked in the Retainer Brite, and rule that out straight away, and then go on to try the next set of trays. I could not get home fast enough and spend some time washing in plain water the third set before putting them in. An hour later……same problem, horrendous dry cough, and my body wants the bottom one OUT. The next 24hrs will be really important to me if I can stomach these. My dentist is going to ask about the option of Hypoallergenic trays……it appears from other blogs this may be an option. We will see. Right now I am really fed up. This is not a problem I saw coming.