Enquired re these kits at our local chemist's: unknown in France.
Reckon they're OK as a stopgap (har har) but AFAIK fillings are usually lost by
herpes caries creeping round the sides, and using DIY repeatedly is just allowing the rot to work away underneath.
Remember that lovely Dara Ó Briein bit about "one one side we have Dr. X, a dentist with 25 years study and practice, and on the other side we have Barry, who removes his own teeth with a bit of string and a door". Potocki dentisty.