Hi.
I want to ask that my incisors are not aligned my age is 25. So what is the best option for me to have fixed or removable braces?
And approx how much time they both take?

Hello AY26,
There is no way anyone can give you answers to your questions here. Your best bet would be to have a consultation with an orthodontist (a dentist who specializes in braces) who can give you an accurate cost and length of time the treatment will take. The Invisilign (removable braces) are effective in some cases but not all.

My dentist recommended veneer is it OK to have it?
He also pull out my 1 tooth and instead of that will set an artificial one?
Above procedure is all right?

Yes and yes
That being said, we can't possibly know if you have a good dentist, and if what he is doing is what your teeth need.
My theory of anything done to my body is to research each test, treatment, surgery, drug, and cause of whatever the problem is. Be an informed patient.

Not knowing the full story of your dental history leaves me with only a partial answer. The tooth he pulled out was too bad to save?

Nothing wrong with veneer, it is used regularly when a person wants a decent looking mouth and it corrects many imperfections. It certainly over rides more expensive ways of permanent bridges.

Where is the tooth located in your mouth that he pulled out, if at the back of the mouth, you will not need a replacement.

You certainly have the option of getting a second opinion by another dentist.

It is lateral incisor and pushed back. He said by braces it would take much time to be in right position.
If veneer has the life span up to 10,20 years what should I do after this time?

After removing the tooth he implant new one and make space with the adjustment of veneer on 4 to 5 teeth.

You don't have any options after veneers wear or chip off is to replace them. Have you considered crowns ! The cost is about the same per tooth.

Are Crown better option??

Both fixed as well as removable braces will make your work done. Removable braces will require cleaning regularly after having your meal. Whereas fixed will make your work very swiftly.