wow, estimating board feet over the time I started using that blade, hmm..
I have cut somewhere around 2 dozen 3/4" 4x8 sheets of oak, cherry and maple veneer plywood, which each had maybe 50 individual pieces, many with multiple cuts to finish.. bevels, angled miter end cuts, and such.. at least a dozen 1/2 Baltic birch, which each sheet also was cut into 10 to 50 individual pieces... maybe in the area of
600 to 1000 board feet of 3/4 to 1 1/4 hardwood rips for moldings I make.. yeah, very well used indeed, and I can still cut a 3/4 piece of veneer ply with, maybe just below perfect finish cuts, both rip and cross cut, still absolutely clean cuts to say the least.
As for what I do for upkeep on the blade, nothing more than being as careful as I can with how I feed wood into it, always making alignment a top priority, and routine checks (even several times through out a full days use on the saw), and simple cleaning with easy off oven cleaner and scrub brush. I generally dont even need to clean the blade all too often, as careful as I really am with cutting with it. I think I have cleaned it around 5 times total in fact..
I have never touched the carbide teeth at all, with anything other than the scrub brush (not a wire brush) or my fingernail, to answer your actual question..
So, theres a good example of low maintenance on a good quality saw blade, and its outstanding long term use. I in no way claim that my methods are the best, or even the proper ones.. but I have had good results with them *shrugs*