Dentist's High 

The time period, usually a week to a month, after a dentist's appointment where you actually brush your teeth three times a day, floss, and use mouthwash. After this time period, one goes back to their old ways of dental hygiene.

I was on a dentist's high, but then I went back to my usual tooth brushing schedule

Dentist's High by EthanO May 7, 2011

Dentist's Office Fear Syndrome 

The fear that always creeps into your mind while sitting in the lobby of the dentist's office, even though you know it's just the dentist and you're being stupid and panicking about nothing. Many people try to calm this syndrome by reading one of the magazines or books in the lobby, but usually this just makes things worse.

(In the Dentist's Office)
Bob: (reaches for lobby magazine and starts reading)
Tracy: Gosh Bob, I've never seen someone look so nervous reading a magazine before! What's wrong?
Bob: Uhhhh it's nothing, really.
Tracy: Bob, don't tell me you still have Dentist's Office Fear Syndrome!! I thought you were over that years ago!!
Bob: Ahhh stop it!! I can't control it!!(Breaks out in hysterical crying)

Dentist's Office Fear Syndrome by Dr. Philbern June 29, 2011

angry dentist 

To wipe your ass with someone's toothbrush

Dude why does your breath smell so bad? Did someone give you an angry dentist?

angry dentist by SlimGravy January 6, 2010

The 10th Dentist 

Someone who has an opinion in which will very likely have 9/10 people disagree with

The 10th dentist: I do not recommend ‘Crest 3D whitening toothpaste’. I also love eating candy corn!

The 10th Dentist by thedomobud September 12, 2022

Dentist 

An asshole that tells you to open your mouth wide and the proceeds to insert things in your mouth.

Dude I just went to the dentist and I had to open my mouth wide and then they put things in there.

Dentist by Your a wanker November 22, 2016

Mother Father Chinese Dentist 

Very obscure slang/substitute for swearing in frustration or anger.

Origin:
HBO television series
Mr. Show with Bob and David (1998 season 4, episode 5: It's Perfectly Understandable)
Sketch: Pallies (A Goodfellas parody, edited for television)

David Cross turns to Jay Johnston and yells (with terrible over-dubbed editing):

"Well you's can both grab one of my *books*,
you mother*father* *Chinese dentist*"
before shooting Jay in the head.

According to the Season 4 DVD commentary, years after the show ended, cast member Paul F. Thompkins had overheard someone talking on a cel phone in a bar utter the phrase "Mother Father Chinese Dentist!"
When asked if she was a fan of the show, her reply was "What?"

Mother Father Chinese Dentist by FlowersInMidgar April 19, 2007

Trash dentist 

Trash dentist is a character in the song novacaine by ghost and pals and creep-p, Trash dentist has no official gender, trash dentist is the worst dentist ever even ripped tooth HURTYS jaw off

"TRASH DENTIST YOU RIPPED MY JAW OFF"

Trash dentist by Koi.cos December 27, 2021