Probably a month ago I experienced pain on my lower molar tooth on the right side(second to the last) . I went to dentist for him to check it out, but he did some xrays and saw that I only have to get a filling done on my lower last right side molar (but that's it). After a month, the tooth that I originally was complaining about became loose (again). Everytime I bite, I experience sharp pain. When I woke up this morning, I felt a bump on my gum (where the irritating tooth is located). Not to mention, the tooth that Im experiencing pain with has a filling done 2 years ago.

What do you think it is? Something caused by gingivitis or an abscessed tooth?