Question 1

What happens when you sneeze?

Accepted Answer

Hi.  I can only tell you my personal experiences.  These screens prevent me from sneezing.  Just be sure to clear the mess inside the nasal passages first.  
Now, my nose sometimes can get a little runny because the membranes are cooling inside...I just remove them blow my nose and reapply the same pair...They do re-stick with no problems...
I've been using these screens for a few years since Shark Tank.  It took a few sets at first to get comfortable and understand their practicality but now you couldn't ever change my mind.
These screens prevent sneezing so long as person clears out their nasal passages first...
I don't know how, but when allergies or smoke is really bad and I know this going into work or outdoors I do step #1 (clearing out my nasal passages) and then #2 turn them sideways (fits my nose better) #3 put them on before entering whatever environment I'm about to enter and that's it.
Remember that the screens are a preventative...They won't treat your symptoms but they will prevent them from ever occurring...
If you do your part, they'll do theirs...No sneezing at all...
I'm a BIG believer in these screens... 
Skeptical at first but they proved themselves to me for the past few years...
Hope this helps and thank you for asking...

Question 2

Can they be re-use after only wearing them for 10-30 minutes around relatively clean air? I just can't stand strong odor from cleaning products.

Accepted Answer

The filter part will most likely be okay, but the adhesive may not stick when applied the second time. I tried to adjust one after wearing for about a half hour, and it didn't feel secure. I don't believe it will filter strong odors, just particulates in the air. Good luck. Hope this helps.

Question 3

How do you know what size to order?

Accepted Answer

These come in 3 sizes Small, Medium & Large. Most people know if they have Smaller or Larger nostrils than an average adult. All others should use the Medium.

Question 4

How many nasal filters comes in this multi pack?

Accepted Answer

It says on the pig, but so small it's hard to read. There are 7 sets per pkg.

Units	1.0 count
Brand	First Defense

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First Defence Nasal Screens - Multi-Size and Quantity Packs (1-Pack, Medium)

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