зъбест (Bulgarian) comes from Bulgarian зъб, from Old Church Slavonic зѫбъ, from Proto-Slavic zǫbъ, from Proto-Balto-Slavic źámbas, from Proto-Indo-European ǵómbʰos, from Proto-Indo-European ǵómbʰ- — to pierce, gnaw through; tooth, horn, peg.
зъбест (Bulgarian): toothy