On the advice of my splendid dentist, I use an oscillating toothbrush — the kind where a round brush spins around to scrub all those embedded pieces of sparerib from between your molars. It's a great tool but you have to replace the brush heads often.
I am just back from a drugstore where I went to buy some. A package containing three replacement heads was $29.95. I was about to buy one when I noticed that a brand new oscillating toothbrush, which comes with four of the exact same heads, was on sale for $23.95.