Yeah, the only cavities I've ever gotten were due to grinding my jaw while I slept (my dentist says my jaw muscles were some of the strongest he's seen, so you can imagine the damage my freakishly strong jaw would've done if I didn't take excellent care of my chompers). Since I've started wearing my night guard, I've been cavity free.  It really isn't hard to brush your teeth 2-3 times a day and floss/use a water pick at night. Fats are just lazy and have a shit diet.