As beard get longer, the possibility of small tangles increases and so a wider toothed comb is much more comfortable to use. The wider teeth mean you will be less likely to use this on a waxed moustache (where a Kent pocket moustache comb would be more appropriate). The benefit here is less transfer of beard oil into the moustache and less chance of moustache wax onto the beard.
Kent’s handmade combs are saw cut, and then hand polished and buffed to create soft rounded teeth that will not damage your hair or scalp. They are made from cellulose acetate, a non-petroleum based plastic derived from plants that has been found to create less static in hair. These teeth run smoothly through the beard & stimulate the natural oils inside the whiskers as they're combed. Here is blog post about these combs.