Scientists have since waffled over the exact nature of these structures. True teeth are composed of specific tissues, including dentin and enamel, which are notoriously difficult to observe in frog teeth due to their diminutive size. ‘They’re incredibly small, each about the size of a grain of sand,’ said lead author Daniel Paluh, a doctoral candidate in the University of Florida’s department of biology. ‘There’s no way to confirm the presence of dentin and enamel in frog teeth without using high-resolution techniques.’