What does it mean if a silver tooth gets loose and you had it for a couple years now?

Filling or crown: If a silver filling comes loose it must be replaced asap...Leakage can result in cavity around the filling. If it's a stainless steel crown, they fare only supposed to be temporary restorations. Should have been replaced with a permanent crown years ago. Please call your dentist before the loose crown turns into an abscessed tooth.

Examination: Please have your dentist examine the tooth in question. Hard to understand from your post if the filling in the tooth is loose, if the entire tooth is loose, or if you have a sliver colored crown and that is loose.

SS Crown?: We can't be sure what you are referring to nor the cause of the problem. It sounds like you are referring to a stainless steel crown. On that assumption, the crown could be loose, or the tooth is loose. Ss crowns are inexpensive temporary solutions. Is the tooth a primary (baby) or permanent tooth? You will need to see a dentist for an accurate diagnosis and appropriate treatment.