Bridge popped out in less than a year. I wanted to know why and how this happened?

Hi:This can be as a result of decay under the bridge and clenching and grinding habit.Best,Dr. Maddahi

It is important to see your dentist immediately.  If the bridge came off, and the teeth are healthy underneath then the bridge can be recemented.  If part of your tooth broke off with it then it can be more complicated and you may need additional procedures.

I hope that you can will your dentist right away and make an appointment to see him/her.  The bridge might be able to be recemented.  It might be just as simple as that.  If part of the tooth came off with the bridge it will be more complicated.  Please see your dentist asap.