Will Porcelain Veneers Fix my 4mm Gap?

The larger the gap, the more teeth that need to be veneered.  If you ONLY do 2 teeth, those two teeth will look extremely fat, which means you should consider 8-10 veneers.

 

The longest lasting, most conservative and cheaper treatment would be braces or Invisalign.

Veneers can close a gap that large but as stated by others, the bigger the gap, the more veneers you will need in order to maintain proper proportions of the teeth.  In general the best result comes from veneers on the teeth you see in the smile, typically 10 teeth.  It also gets fairly aggressive in terms of tooth removal when you are closing larger spaces so at least get an opinion of what would be involved in move the teeth with braces/invisalign to compare.

The larger the gap, the more teeth that need to be veneered. If you ONLY are considering two teeth, those two teeth will look extremely fat, and you may look like bugs bunny.  You may want to consider 8-10 veneers. The longest lasting, most conservative and cheaper treatment would be braces or Invisalign. Consult with a local dentist to see what your options are.