and it doesn't look right to me. I expected to see a simple white line, but it actually looks quite wide and appears to have a cavity in the centre!!! He has had no sugar etc that could have caused it, so I'm trying to convince myself it's a piece of gum that hasn't moved away yet iyswim but it's hard if I run my nail over it. I know there's nothing I can do but am really quite conerned, does anyone else have a similar experience to put my mind at rest for a couple of months, please??