The phrase "pointy teeth" is correct and usable in written English.
You can use it when referring to the sharp appearance of someone's teeth. For example, "She smiled, revealing two rows of glistening pointy teeth."
It's got big, sharp, pointy teeth.
Carnivores generally have large, pointy teeth.
The children cannot resist David with his spiky hair and sharp, pointy teeth.
The women wore costumes decorated with a dragon-like creature with green eyes and pointy teeth.
Large eye sockets, indicating fine vision, and small, pointy teeth both suggest that it hunted insects.
On this bib-napkin, draw its trademark print of an open mouth with curved-pointy teeth.
Alexia Karavela's slightly ironic yet heartfelt oil crayon sketches were inspired by photos found at garage sales: women dancing in a circle; old men sitting on a couch, drinking; a bride with fierce, pointy white teeth.
While snapping his way through the fastidiously set-designed detritus (a specialty of Mr. Ridley's), Jamie takes a shot of a hooded figure with a reptile face and pointy metal teeth.
Some members of the media have pointed out that our story contains eerie parallels to the current situation, and that's their job, I guess — to scare away potential moviegoers, at least when they're not pawing through my garbage, their tiny red eyes caught in the glare of my security lights, their pointy yellow teeth flecked with coffee grounds and dripping rancid goo, possibly separated butter.
Although this marine creature resembled a large and poorly-made sausage, its mouth was well-stocked with pointy, menacing teeth.
