An important consideration for certain applications such as cross cutting solid woods, dense materials ( to prevent tooth breakage &/ snatch). Be mindful however that more teeth equates to more resistance & therefore slower cutting feed speed but a much cleaner finish generally. Also more teeth, means cutting work load is shared between all the teeth, thus offering a longer service life. This type of blade would ideally be suitable for Plywood, laminated materials, sheet goods in general, plastics & non ferrous metals. Typically anything from 48 to 120 teeth depending upon diameter of blade.
Having said that it’s not necessary the best solution if you need to rip cut for example, as a high tooth count also means a much smaller gullet ( space between each tooth) which will clog up far too soon & lead to burning rather than cutting. In fact the machine will struggle to go through very quickly indeed, you will notice it straight away & will feel like the blade is blunt.
A low tooth count is ideal for rip cutting as the gullets are very large & therefore able to cope with chips extraction much more efficiently. As a result of lower resistance offered by the fewer teeth, cutting feed speed is greatly increased. Quality of cut will never match that of a high tooth blade. Now you are thinking, why don’t I buy a low tooth count blade for both rip & cross cutting as well. You can but the overall result will yield greater & more tear outs & splinters to the point where the material will look more like it’s been torn rather than cut. Maybe fine on a building site, Not quite what a cabinet maker would want however.