No other reason to miss the stuff you hate more is more popular than the dentist excuse.  Missing a day or two is hard work... and due to some dental work or surgery to be done is one of the most plausible excuses you can use.  The range of dentist excuses is so spanning, you can choose whatever explanation that will suit your situation.  Oral prophylaxis, tooth filling, tooth impaction, root canal, tooth extraction are only some of the dentist excuses that are useful and believable.  

It is very natural for people to experience downtime in their work or study life when hit by dental problems.  If these problems would require you to miss a day or two from work or school, make sure that your dentist excuse contains all the important details to make your prank believable.  An efficient dentist excuse contains the following information: a) dentist’s name and contact information, b) inclusive dates of absence covered by dental work and c) documentation of the dental job done.    

Pain caused by a simple toothache can totally destroy one’s day.  It will be impossible to concentrate on work or school activities when the throbbing of bad teeth gets in the way. The dentist excuse will afford you the flexibility of having an efficient reason for missing work or school time, and your boss will love the humor of the prank.  Even the simple dental problem like tooth filling or extraction may require you to rest from work or school for a day or two, and more complex problems needing dentist excuse like root canal and tooth impaction would even use up more than two days of downtime.  The time off from work or school can be used to rejuvenate from the dental workup and also to give you respite from work or school stress. (I'm Joking!) 

Giving yourself enough time to recuperate will also give you the necessary period to take a breather from the stresses of work or school.  Coming back to work or school will be a welcome treat, you can face the day as a renewed person.  Your dentist excuse will be your concrete reason for nonattendance at work and in school.  Management and the academic institution will understand and accept the predicament of someone needing dental attention.  Recovering from dental procedures like tooth extraction, root canal or tooth surgery can be daunting task, requiring full rest and reprieve from highly-physical work.  (The above is hypothetical, our notes are for novelty use only)