How does a band become eroded?

I am concerned about band erosion. If the band is located on the outside of the stomach, how does it become eroded by things going down on the inside of the stomach? I have a lot of knee & shoulder pain so I've been taken a liquid Rx pain killer and sometimes I take Advil. The advil was great but I was told not to take it because it causes erosion. I am wondering have I already caused damage to my band. I've also had my share of cocktails. It's been one year since my surgery. Is there a test that will show if any damage has been done?

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