Rainbow Dash, fastest pony in all of Equestria and future member of The Wonderbolts has no fear of anything! May it be heights, depths or anything else!

Well... Maybe there's just one thing that she's afraid of- even though she might not admit it herself -, and that is the dentist.

Coming from a childhood trauma she sooner wants to forget, she is deadly afraid of going to these doctors. And the princesses pretty much hate her by now, because of all the days that she could have had a tooth ache, it is just today! Now, join Rainbow and her friend Twilight in this journey of madness and Twilight's growing annoyance in going with Rainbow Dash's antics until she finally finds enough courage of facing her fears and going to the dentist!