Is There Any Connection Between Porcelain Veneers and Bad Breath?

The odds are that porcelain veneers are not the cause of your bad breath.  When performed correctly, porcelain veneers should collect minimal bacteria.  Bad breath is the accumulation of bacteria in the mouth over a period of time that is not removed.  Make sure to brush several times a day preferably with an ultrasonic toothbrush and floss at least once a day to break up the bacteria between the teeth.  Now if there are open margins in your veneers or open contacts where food is accumulating, then this would cause bad breath.  If not, there is another issue causing this that needs to be determined by your dentist. 

Bad breath, or halitosis, is most often caused by a collection of bacteria in the mouth.  Well made veneers are countoured similar to teeth and are likely smoother (highly polished), so they should NOT collect bacteria any more than teeth normally would.  If contours are bulky or ledges are present or if they aren't polished well, then bacteria CAN collect, and it is possible that NO hygiene habits will help.

If porcelain veneers are the cause of the bad breath, then they should be replaced.  Odds are they are not and the cause will need to be determined.

Porcelain veneers shouldn't lead to bad breath.  Bad breath is usually caused by bacteria in the mouth that is not cleaned away in a timely manner.  When done well, porcelain veneer are smooth and seamless.  There should be no little nooks or crannies for bacteria to live, therefore no bad breath.

Treat your veneers as you should treat your teeth.  Floss, and brush at the minimum.  Rinse well and you should be fine.