ad6796d2_Box_Turtle_Health_Chart__Treatment
[Symptoms] Malformed and soft shell with an overgrown beak. [Common Cause] Metabolic bone disease. [Treatment] 
If the shell is not too soft, a corrected diet and the providing of a proper UVB light can correct this problem. If severely soft and deformed, a vet will need to evaluate the situation.
Box Turtle Health Chart
Treatment