Originally saws were made from fairly hard steel and from time to time the teeth would be re-sharpened using a file and reset using special pliers. This took a fair amount of time and specialist skill.
Over time improvements in manufacturing processes led to the development of hardpoint saws, which removed the need for manual sharpening completely.
A hardpoint saw can be identified by its blackened teeth (from the heat treatment), although this can be difficult with colour coated blades.
The vast majority of saws now available are hardpoint saws, but even then the quality of the steel and heat treatment used can have a big effect on the length of time the teeth stay sharp. Poor steel combined with poor heat treatment = bad value for money.
A hardpoint saw has teeth that are tip-hardened to give an extra long effective cutting life. The teeth will typically last up to 5 times longer than unhardened teeth and they are particularly suited for cutting man made composite boards such as Chipboard, Plywood and Hardboard.
"The teeth will typically last up to 5 times longer than unhardened teeth"
The C.K Sabretooth™ saw is a hardpoint saw that uses premium quality steel combined with exceptional heat treatment control. The result is a saw that gives a first class speed of cut and outstanding wear resistance.
The only draw back of hardpoint saws is that they can not be re-sharpened, but the time-saving achieved, combined with the relatively low price, makes them a much more attractive option.