It's one of those things that once you see it you know exactly what to look for......Some pick it up immediately, some take awhile.....Digging is pretty much non-productive....Most 'finds' are laying on the surface or partially sticking in the sand/shell beds/gravel etc...You'll spend a lot of effort/time, picking/pulling and flipping things to see what they are. [wear gloves, I use Home Depot mechanic's gloves...They're cheap, tough, last longer and a lot less expensive than dive gloves]...You'll find lots of small teeth and broken large ones, better known as 'heart breakers'...... It's the larger, complete ones that are hard to find.....If you don't know what something is, bring it up, you can always put it back.....But there are many other types of fossils other than teeth and you may just find something rare and never found before......There's a couple of good small books w/pics that'll help identify the most common fossils/teeth.....Be patient, go slow [your air will last longer] and look for areas that have Manatee and other types of bones laying around [We call them 'killing fields' ]....They usually have a higher concentration of fossils and you'll have a greater chance of finding something....south of the pier isn't as 'picked over' and the viz is usually better....But it's 'patches' and not one big 'boneyard'...Watch your bottom scanner and you may have to do several 'bounce' dives to find a good spot....But if you find a spot that's been recently uncovered or missed, it'll be full of teeth.......Found a spot like that a few years ago and found 20+ complete teeth [and other fossils] in the 2-4.5" range !!!!!....Like shooting a hole-in-one or 20 out-of-20 clays !!!!......Good luck, post some pics if you find anything.......