How long have you had this turtle? Where do you house the turtle? What type of dock/dry place do you provide for this turtle?
You reference Tortoise, you do understand that this is a water turtle correct???
Did you just get this turtle? Looks like it had a huge amount of shell rot but everything looks pretty well healed now. The missing shell will never return. Seeing the damage that was done id take a trip to the vet just to
Make sure there isnt any active shell rot and clean it out for you but for the most part everything is fine now and looks healed. It will just have that look from now on but its perfectly fine.
Thanks every one for the help...and ascot, i have this tourtle since 2009 i think, and i keep it in a simple thank whit a big rock were it can get out of the whater... and i do anderstand that its a whater tourtle (sprry for my bad english)