scanners

I do not have any idea what scanner to get.
I was fixng my daughters school pic and found the scanner left lines. So I looked and saw dust inside the scanner under the glass. I tried to remove the glass and $#@&^%$^&. I have…had a flatbed.
Im studying now but think I need a second opinion. I want to do photo repair. Is a flat bed better? Will a sheet fed bend the original? I need to know it will not get %^&%## inside.
I know there is here at BA one that repairs photos professionally but I for got the name.
Thanks

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