Next time in the UK look up "Boots." They have lots of little things like toothpaste, tweezers, etc.

https://www.boots.com/sitesearch?searchTerm=toothpaste

If you are in Germany, Austria, Czechia, Slovokia... you can go to "DM" (from Germany for Drogerie Markt - "Drug Store"). They have everything like Boots has and more.

https://de.wikipedia.org/wiki/Dm-drogerie_markt

In the Netherlands (not sure about the rest of the Benelux) look for Etos / Albert Heijn

https://www.ah.nl/producten/merk/etos

Sorry, no time for more small-talk ;-)