(Concern) Gap in the front teeth

It's been quite a while since my front teeth have been separated.

Initially, my front teeth were slightly separated, so I filled the gap with resin, but it didn't work well and fell off quickly. It's not severe, but currently the resin is slightly attached, and I am living with the gap.

Recently, many celebrities seem to have laminate veneers and appear on broadcasts, but previously, someone’s laminate veneers fell off, so they...

They seem to be showing their teeth, and it looks like they had their front teeth heavily ground down and got veneers. At first, I didn't really know what veneers were, and I was quite surprised when I saw a photo of their teeth. I'm curious, when getting veneers, for example on the front teeth, how much of the tooth is typically ground down before the procedure?

Previously, when my teeth were cracked and filled with resin, the process of grinding the teeth was a bit stressful for me, and I also felt some anxiety about whether it was necessary. Additionally, I have a very painful memory of the pain, so I am very worried.