This condition can cause teeth to be discolored (most often a blue-gray or yellow-brown color) and translucent, giving teeth an opalescent sheen. Clinical features include: Discoloured teeth - teeth may be amber, brown, blue or opalescent Bulbous shape to the tooth crown due to cervical constriction Tooth wear/Non-carious tooth surface loss (NCTSL) - due to the poorly mineralised dentine, the enamel of the tooth is unsupported and subsequently shears or chips off as it is subjected to biting forces. This exposes the underlying poorly mineralised dentine which is less resistant to wear. Therefore, features of abrasion and attrition may become apparent. Video lacture are available on our YouTube channel - Explain dentistry Telegram channel - @explaindentistry