Identify a lone bone (jaw including teeth) found on a beach at Trouville-sur-Mer (France) in 2018
It would be great to have a scale bar in the photo, so that the size would be easier to determine. However, by the shape of the teeth, I will propose that it is the back half of the jaw of a pig. Here is an image from the National Maritime Museum:



This one is from Vanuatu and has a rather elaborate mesial portion of the jaw, but the teeth look very similar. It's virtually impossible to know the bone's age or species, however.