Can I buy temporary filling kits over the counter?

[DoubleBluff]

DS1 has toothache, he had a temp filling and is due to get it replaced in the New Year.
If I cant get him on to see the dentist today am hoping to buy a kit and do it myself!
Have seen kits online but wonder if i can buy in the shop?
HELP please - dont want Xmas spoilt by toothache

I think Boots do them in the shops...maybe local chemists too

Yeah, Boots do them, have bought a number of them myself

thanks will head of there if cant gget an appt.
Typical!!