From the upper hard palate , along the gumline between the teeth and hard palate, there is a continuous discharge of saliva which is sour and bitter. With the tip of my tougue, I could feel the sponge texture along the gumline between the teeth and hard palate. On the worse day, I can physically feel the discharge dripping from a tube/duct or spiral discharge to the hard palate. I feel like I have two sets of nose. I have seek helps from ENT, dentist , and oral surgeon, but no one can diagnose what is causing it for the past two to three years.
Maxillary sinus may be accidentally opened during tooth extraction/dental work and can lead to bitter taste in mouth and leakage in mouth. Roots of upper teeth are close to the sinus and mouth sinus communication could have occurred during tooth extraction. This complication is more common when teeth project into sinus when there is considerable bone present between floor of sinus and root spices. In most cases, opening which occurs is small and blood clot filling the extraction socket will close the openings unless the sinus is infected. If opening is of considerable size, then sutures are placed across the socket to approximate gingival tissues.  Some absorbable material may also be used. Large openings can be closed with buccal flap. You can visit an oral surgeon for evaluation and treatment.