Hello, i recently noticed a slight cavity develop over my right lower gum, behind my molar tooth. It can be painful, and the molar tooth next to the gum seems to be slightly detached to the gum now, and it may have some kind of hole.. The gum surrounding that particular molar tooth tends to bleed very easily. im just wondering what could be causing this and if i should go and see a dentist, or its nothing serious? Thank you in advance.