Theoretically, it can be amended. But it has something to do with many problems, mainly age. Oral conditions, economic conditions and so on. Severe skeletal deformities need surgical correction. Generally, it is risky for people over the age of 25 to correct. Look at what you said. It's a little serious (probably skinny). You can go to the stomatology department of a big hospital for a check-up and consult before you consider doing it.