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A tooth spur gear relates to a spur pump gear system comprising a housing have a sealed chamber communicating with an intake port and a discharge port, and a shaft journalled for rotation within said chamber. Besides, a drive spur gear is mounted concentrically on said shaft about a first axis within said chamber, said drive spur gear presenting epi and hypo cycloid tooth profiles. What’s more, a driven spur gear is disposed internally within said chamber for rotation about a secondaxis, said driven spur gear presenting epi and hypo cycloid tooth profiles; said epi hypo cycloid tooth profile of said drive spur gear engagedly driving said hypo cycloid tooth profile of said driven spur gear.