I have gap in between upper incisors due to my non-compliance with clip(given for crowded teeth&2 teeth removed) in childhood.can it be corrected now?

Absolutely: Options include orthodontics, either invisalign or conventional orthodontics, resin composite bonding or porcelain veneers. The solution may involve more than those two teeth, depending upon how large the space, called a diastema is, and whether the position of the lower teeth is the cause of the opening of the space between the upper teeth.

Yes it can.: You must have good oral health, but you should be able to move the teeth together again.

Yes. : You would need to consult your dentist for treatment options. Depending on your situation, you might benefit from composite bonding, veneers, crowns, braces, or a combo. Each has its pros and cons. A full evaluation would be required to make a proper treatment recommendation.

Yes: Orthodontics can be done on adults as long as the supporting bone(periodontal) has not been compromised. There are a variety of ways to treat from regular braces to invisalign type appliances and even cosmetic bonding or porcelain veneers.

Yes: Yes it can. A consultation with an oral surgeon should be made. An x-ray should be taken to make sure there isn't an underlying reason for the diastema such as a cyst or a supernumerary tooth. Secondly, the soft tissue (frenum) should be examined to see if it is contributing to the problem and if so a frenectomy may be required. After that you should seek an orthodontic consultation for treatment.

Most likely: Should be able to quite easily, just see your dentist or orthodontist for consult and make sure your hygiene is superior. Depending on size of the space you may elect to have veneers or bonding done. Just ask your provider.

Orthodontia: Yes. As long as your teeth, bone around teeth, and gums are healthy.

Yes: You will have to be evaluated for the cause of the gap. The issue may involve other teeth and maybe your bite. Options to close a space depending on the size of the space can be braces, invisalign, veneers, or resin filler material.

Yes, with caveat: Teeth can always be moved. Don't just focus on the gap, focus on your entire occlusion. With 2 teeth missing and history of non-compliance, you really should see an orthodontic specialist who will work with your general dentist to provide the best platform on which to do restorative treatment. Shortcuts (6 month smile, invisalign) sound great but don't work well. Go for consultation.