Sharks continually lose their teeth over time and the developing teeth will then rotate in and replace them.

 This rate of tooth loss most probably has to do with what the sharks are chomping on, so its pretty difficult to define exactly.  But for the sake of blogging, how would one go about conducting a study to answer this rate of tooth loss conundrum?  I could grow my own white shark jaws in a lab, apply the known white shark bite forces to various prey items to see how many teeth fall out each time, then apply that to the general diets of various shark populations world wide!  But alas, not terribly feasible however awesome that may be.  So an actual rate of tooth loss is a bugger.  But since this is a blog, I’ll just make up an answer of 19 teeth a week.  Why 19?  Because its the jersey number of the greatest hockey player of all time.  Plus, we also know a shark can eat at least 6 seals in a sitting, and they probably lose a few teeth per seal (check out the image at the bottom!)

OK, but what about our other factor – average lifespan of a white shark.  I am afraid we don’t have a real grasp on this number either!  My next shark fact blog will go into this in greater detail, but it's generally accepted that white sharks live longer than 30 years... which isn’t terribly helpful for our question.  Considering that an orange roughy was aged at 149 years and this lungfish is at least 80 yearsold, we actually know very little about fish life histories!  But again, for the sake of blogging, lets say we have a 30 year old shark.  

So 19 teeth a week = 988 teeth a year x 30 years = 29,640 teeth per year.  Let's add (48 teeth x 5 rows of development) = 240 currrent teeth.  240 + 29640 = 29880 teeth during a white shark's lifetime!