It's a comb where the space between the teeth is wider, but also many times the tines are wider too. In fact now that I think I have rarely seen a widetooth comb with thin tines!
It's generally thought to be more gentle to the hair, causing less friction yet detangling effectively. The longer the hair, the more it has gone through since emerging from the scalp, and being very gentle with it will help it to stay healthy.
Some people actually see a big difference when changing their regular comb to wide toothed one. It also important to have a smooth comb without rough spots and seams.
I personally often use finetooth comb, it helps my hair to be smoother when dry. It has no seams and just glides through my hair at least at this (short) length.
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