question: My dentist put in a bridge in 2012 and told me to keep it clean using a Water Pik.  Then at my last cleaning, the hygienist gave me a threader to use with floss for it.  Didn't know that was recommended.   She said to use it "occasionally".  When I used it  yesterday for the first time, the dental floss came out red: blood.  Very concerned that there is decay under the bridge, which was so costly!   Can this be repaired without having to get another bridge?