Here are some tips...

1) Sadly, the less flavorful brands actually blow the best bubbles. Ones that contain less sugar and are harder to chew work best. The champions use Dubble Bubble and Bazooka. They have more elasticity. Don't buy the softer brands like Bubble Yum or Bubbicilious.

2) Don't add a lot of wads of gum into your mouth. More gum doesn't equal bigger bubbles. If you are blowing a bubble and still have a bunch of gum in your mouth you need more practice. Something interesting to note is that when going for the world record you are only allowed 3 pieces of gum.

3) Temperature matters. As you blow bubbles your gum becomes cooler and that makes the gum less pliable. So chew it to warm it back up. But if your gum is too warm your bubble will sag.

4) Chew your gum long enough to get out all of the taste and sugar. This will strengthen your bubble.

5) When blowing your bubble, blow slowly. Give slow even breaths.

6) Keep your mouth lose around the bubble. If you tighten your lips around the bubble this will cause you to blow harder and will pop the bubble.

7) When starting out practice indoors at first because it's easier to control wind and temperature.

Have fun! And... uh... probably brush your teeth after.