I just saw my cardio and asked about this. He said that the current literature indicates that antibiotics are indicated for teeth cleaning but not for cavity filling. He knows about the European guidelines, but indicates there is evidence that there are higher rates of endocarditis in populations w/o antibiotics than with. He agreed there is no hard science of a direct causal link between dental procedures and endocarditis, just a statistical link.
In my saga with BAV, I've gone from antibiotics with every cold (~1980) to the current state. Now antibiotics are not prescribed for just a BAV. My cardio says antibiotics are only for owners of an artificial valve. For dental procedures, antiobitics are suggested for cleaning but not for cavity filling, unless the soft tissue of the gums will be disturbed and broken.
If you are like me and don't tolerate 2g of penicillin very well (I have an irritable bowel ever since they removed 6" of it) there are options. I used to tolerate the penicillin, but not so much. Last bout I almost went to my GI doctor and I haven't been to them in years. I am going to try Kefalex (?) for my next cleaning. He said there are more than one option for penicillin, they all work, but don't go w/o it.