Q. I have lumineers on my front 4 teeth. I already had really white teeth, but my sister’s boss (a dentist) wanted to try them out and I volunteered. Now, I have a tiny brown dot on the top of one of my front teeth. Can I use an otc bleach to get rid of it, or is this a lumineer problem? How can I fix the brown spot– I live really far from where I got them originally (and my sister no longer works for him).