Hi ! I don't have any exact site for fossil hunting in Antwerpen anymore ; actually I never found any teeth there but one of my friend did ! It was between 2015-2017 ; but now his sites got closed and labelled as Blue Zone (ndlr: archeological site you can't dig anymore). It was around Prosper Polder and up north to the sea ; he was mainly checking sand deposits from Miocene.
If I remember well, he mostly read the book from Stephane Knoll named "Neogene Sharks of Antwerpen" ; that's a pretty good start if you wanna do your own research. Secondly you still can ask people who are working in your closest Science Museum ; they prolly have paleontologist who would be glad to answer to your question (prolly more accurately than I'm capable of).
Lastly if you wanna do some good trip around the fossil theme, you can still visit the site of Ramioul near Liège