The problem with going much beyond 60t on a 10" circular saw with carbide tips is it leaves little room for both a gullet and steel behind the carbide tooth. You can have 80 and 100 teeth but you had better be gentle with them. Usually when they fail the steel is ripped away along with the tooth. A little less of an occurance now with salt quenching and laser cut plates but still a factor worth consideration. Good practice is using as few teeth as produce an acceptable cut. This means fence and blade must be parallel.
Daily Grind Sharpening Service