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I often hear woodworkers say something like "I always buy good quality 60 tooth blades", or something to that effect. When I hear things like that I know that they really don't know how to select blades for the table saw, radial arm saw, sliding mitre or chop saw, because arbitrarily selecting a 60 tooth blade could in fact be the worst choice they could make, depending on what they are cutting.
Cutting Natural Woods - There are only 2 blades you need if you are working with natural wood, a ripping blade and a cross cut blade. That's it - 2 blades.
Ripping blades are used on table saws to cut along the grain of the wood. These blades will have fewer teeth ususally between 20 and 30 with 24 being the most common in 10 inch diameter blades. The other feature on ripping blades will be large gullets (the deep space between the teeth), these are used to clear out the long fibers of the wood as the saw blade moves through the wood.
Cross Cutting Blades are used on table saws, sliding mitres, chop saws and radial arm saws and are often 60 to 80 teeth in a 10 inch diameter blades. The reason a cross cut blade can get away with more teeth is because cutting across the grain doesn't require moving much wood fibre out of the way so the blade can do a better job.
Of course with all so-called rules there is always an exception and with natural woods the exception is Combination or General Purpose blades. These blades are designed to rip and cross cut, and they do a pretty good job of both but they still cannot rip as good as a dedicated ripping blade and they don't cross cut quite as good as a dedicated cross cut blade. If you have a budget and can only purchase one blade, or if you are constantly ripping and cross cutting, get yourself an excellent combination blade.
Freud had recently introduced a new multi-purpose blade that gives extraordinary results ... especially for a general purpose blade. It's called ther Freud Premier Fusion and uses a special tooth design employed by Freud. It's a bit of an expensive blade compared to others, but when you see the results that are obtainable from a general purpose blade, you will see why - they are extraordinary.
Cutting man-made woods like plywood, hardboard, Medium Density Fibre Board (MDF) Particle Board and chip boards, all require a different types of blade, depending on the materials.