I was taught as a teenager that it was acceptable to use a toothpick at the table in France and Italy, but not, repeat NOT in Britain, Denmark or Germany. I was also taught that well-mannered French and Italians held their table napkin in front of their mouth while employing a toothpick, and that they did not attempt to converse at the same time.
In the 1970s Denmark became obsessed with dental hygiene to such an extent that people brought a tooth brush with them when dining out, either in restaurants and in private homes and would bag the bathroom for ten minutes or so after a meal to brush their teeth. Suddenly toothpicks appeared on tables and were generally used, with no attempt at discretion.
I do not enjoy watching people picking their teeth, renewing lipstick and powder or combing their hair at the table, but unfortunately you commonly see all three things being done there.
Babies' dirty or wet nappies were not changed in public either, when I was young, then for years they were, now young parents seem to be reverting to former standards on this point, thank Heaven!
On the other hand, we were all taught to wash our hands before sitting down to any meal as well as before setting a table - now no-one bothers about this either and my father was accustomed as a GP doing home visits to a basin, clean towel, soap and a jug of warm water being provided so he could wash his hands in the bedrooms of the 1950s and '60s that did not usually have a wash-basin installed.