Mellay, Daniel,
Thanks for the information. I am opening my mouth by first letting head fall back and using gravity to help open my mouth gradually. After about 2 weeks, I think it works better with opening and shutting action. Otherwise the throat tends to get dry and feel a bit sore. Also, I am gauging progress by the number of fingers I can stick in my mouth to measure the height of the opening. My pre-ops height was 3 fingers (index to middle finger). I am now 2 fingers wide (abt 28mm too!).
I bought a toothbrush for 2 yr olds which has got shorter bristles.

You all are so brave to have undergone so much surgery. God bless you all and may you get well soon.