Dodgy filling

Right at the start I managed to get a quick filling done at the dentist just before I started chemo ( see : Start to get info out at work). But now I seem to have lost that filling. I only just noticed at bedtime it had gone. I can't be sure when it fell out, it could have been days. Hopefully this is not a problem as they advised me right at the start that having dental treatment during chemo was not a good idea.