HI, I have read your problem, It is not possible that after getting two and half year treatment ,teeth are not aligned with ideal age of patient. Overweight
is not a problem in aligning teeth.I am suggesting you search good ORTHODONTIST for proper treatment, he or she will 100% solve your problem.Removable applaince are only given at the time of retaintion (to retain new positin of teeth). Now a days so many types of modern braces are available which are not creating any problem to patient.
all the best.