When juveniles have been affected during growth, they may have poorly mineralized and pliable mandibles which is a sign of prolonged MBD. This results in distorted jaw bones and a characteristic facial 'smile'. In [[Chameleon|chameleon]] species, MBD causes difficulty protruding or retracting the tongue. | When juveniles have been affected during growth, they may have poorly mineralized and pliable mandibles which is a sign of prolonged MBD. This results in distorted jaw bones and a characteristic facial 'smile'. In [[Chameleon|chameleon]] species, MBD causes difficulty protruding or retracting the tongue. |