All of the following are true except:. a) You can help prevent mask squeeze by exhaling periodically into your mask during ascent.
b) Regular dental care and ensuring your teeth are free of gas spaces can help prevent tooth squeeze.
c) If you experience a reverse block, descend to a point where the pain subsides, then ascend slowly while wiggling your jaw and swallowing.
d) Repeat this process as needed until you can ascend without pain or discomfort.
e) The danger in taking decongestants is that they may wear off during a dive and have other possible side effects.