👉 Subpellucidity is a condition in which the mucous membranes of the mouth, particularly those lining the lower third of the tongue and palate, are thin or dry. It occurs when there is an excess of mucus that is not being properly cleaned from the teeth and gums, leading to a decrease in saliva production, which can lead to dry mouth symptoms such as difficulty swallowing and soreness in the throat. This condition can be caused by various factors such as stress, smoking, or certain medications