Does it yellow with wear?

Mine has stayed white every time I have used it, with one exception. I used a China Glaze topper over it one time as something different to add some sparkle and it immediately shrank at the tips and yellowed all over. I could see it happening as the topper dried because I was polishing under very white lights. I have been using three or four coats of the concealer as my new favorite white polish for a few months now. I use the LONDONTOWN Gel Genius top coat over it. I usually put another thin coat of top coat on the fourth day and I always get at least seven days before I feel any need to remove and reapply.

Is this beneficial for nails?

For me it is currently concealing my very first attempt at using a nail drill to do my manicure. Let's just say I should have stopped after I did one nail, but in my defense you can't see the damage you've done until the nails start growing! But anyway, without this stuff you can see a half moon ring of red across the middle of every nail where the drill bits were obviously wearing down my nail as I thought I was just removing cuticle. The damage has been growing out and it will take about three more months before it's at the tips and then gone. Meanwhile, it looks terrible under EVERY polish except this concealer. This stuff has literally saved me. It completely covers over the damage in three coats and it looks beautiful as an opaque polish! So that's a huge benefit to me.

what is the shelf life of the illuminating concealer?

Hello, Thank you for reaching out about LONDONTOWN’s Illuminating Nail Concealer - From the time of opening, the product is best used within 24 months. Each bottle is labeled with the date of expiration. We hope this helps - Please reach out to us with any questions on the Illuminating Nail Concealer, or any LONDONTOWN products! Thank you