Hi, I recently had a lady with VERY flat thumb nails. The rest of her nails were ok, it was just her thumbs for some reason. I had a really hard time getting a white tip to stick on and when it did it wasn't a great shape, very flat looking (obviously!) I have a feeling that they will 'pop off' quite quickly. I did explain this to her and asked her to let me know if this happens (it was 3 days ago and no word yet!) Is there a different way of dealing with this? Thanks.