When most divers consider buying dive equipment they do not think about a very important item that is easy to buy but overlooked but can greatly enhance your dive experience.
Molded scuba mouthpiece, there are lots of options, one company is SeaCure at http://seacuremouthpiece.com
A moldable “and remoldable” mouthpiece offset for both the upper and lower jaw positions means a more comfortable dive especially for kids and women who have a smaller bite. You can carry this on vacation with a zip tie and just put it on the rental regulator for the length of your dive vacation, its like having you own reg.
Trust me you will be amazed what a difference it makes!