If your teeth are in relatively good alignment then veneers can be a very minimally invasive treatment when carried out by a dentist who has been trained in Cosmetic procedures.

If you think of a veneer as approx. 0.5 mm thick then this is the amount of reduction from the front of the tooth in order to make room for the veneer - yet the end result will be a smile of your design with no gaps in a relatively short time.

See this link for an example of this type of work http://www.umbrellasmiles.com/portfolio.html

However it is important to note that braces can also be used to achieve closure of gaps

I hope this info is of help

Dr