Exostoses; Hard Bony Lumps under your gums
The bony lumps in the gums above and below the teeth are the exostoses. It is theorized that these form in response to a long standing bruxing (grinding and clenching) habit as a way to fortify the bone that supports the teeth. When a dentist sees these, he knows he is in for a difficult job if he has to extract these teeth. After the teeth are removed, these bony bumps remain and present a problem for denture wearers.