12 unit bridge

I have had a 12 unit bridge, all of my top teeth, for 9 years and all crowned teeth are root canaled.  The last tooth on the left is bleeding off and on and every time I floss or use a water pik.  Also, when I floss, I can feel the floss going in and actually touching the tooth - as if the cement is gone, and it gets caught on the crown, (I assume), because it frays the floss.  Can the tooth underneath be treated, if need be, without removing the bridge.  If the bridge has to be removed, can it be put back on?  

[Ramin Mehregan, DMD]

Dear Patient
You could be having some Periodontal problems in that area. Have it checked by your dentist.