I went to the dentist privately 6 months ago and he found 4 decays. I saw him again a few weeks ago (they pester you for check ups every 6 months which seems excessive) and he said there's 4 more decays. How on earth can that happen in the space of 6 months? Especially given its the same scan from 6 months ago!! He apologised and claimed he only just spotted the others?