Will my dentist be able to tell if i'm bulimic?

Usually yes: Stomach acids wreak havoc on the inner surfaces of your teeth, eating away at the enamel. It depends on how long you've had this problem. I suggest that you seek professional help for this unhealthy habit. All the best...

Often Yes, but: Please inform your dentist. Also, remember we are not here to judge you, we are here to help you. Often consistent use of Fluoride or mi paste will help reduce the damage this affliction can cause. Please seek professional help (internist, family medicine, psychologist or psychiatrist) best of luck with treatment.