PROMPT GUIDE

Mouth Prompt List (Fang, Cat Mouth, Omega Mouth, Sharp Teeth, Frown)

The basic approach to mouth shapes is to decide first between open mouth and closed mouth, then add one shape tag. A cat mouth is :3, a single snaggletooth fang is fang, and shark-like teeth are sharp teeth. Many of these tags look like emoticons, so write them exactly as they are, symbols and all.

Last updated: 2026-10-16 approx. 1 min read

日本語版

Tags for how open the mouth is

Mouth openness

Tag	Meaning	Note
`open mouth`	Open mouth	For smiles and surprise Details
`closed mouth`	Closed mouth	For a calm face
`parted lips`	Slightly parted lips	For a face like she's about to speak
`:d`	Wide-open laughing mouth	For an energetic smile
`:o`	Round open mouth	For a surprised face

Mouth shape tags (cat mouth, omega mouth, frown)

Anime-style mouth shapes are specified with emoticon-like tags. Write them as symbols. :3 is a cat-like mouth, and it also produces the omega-shaped mouth.

Mouth shapes

Tag	Meaning	Note
`:3`	Cat mouth / omega mouth	For a cute, mischievous face
`wavy mouth`	Wavy mouth	For a flustered or troubled face
`triangle mouth`	Triangle mouth	For a comically startled face
`frown`	Frown (downturned mouth)	For a displeased or angry face
`:t`	Pouty mouth	For a sulking face
`tongue out`	Tongue out	For a playful "oops" face

Teeth tags (fang, sharp teeth)

Teeth tags

Tag	Meaning	Note
`fang`	Snaggletooth fang	A small fang on one side only
`skin fang`	Fang drawn from the mouth line	A typical anime-art way of drawing it
`fangs`	Fangs on both sides	For vampires and animal-eared characters
`sharp teeth`	Sharp teeth / shark teeth	For cool or energetic characters
`teeth`	Showing teeth	For a big toothy grin
`upper teeth only`	Only upper teeth showing	Common in anime smiles
`clenched teeth`	Clenched teeth	For frustrated or enduring faces

Expression and mouth combinations

Expression	Combination	Notes
Energetic smile	smile, open mouth, :d, fang	The fang adds energy
Mischievous	smug, :3, half-closed eyes	Cat mouth with narrowed eyes
Flustered	blush, wavy mouth, sweat	Adding sweat makes it a flustered face
Sulking	pout, :t, looking away	Looking away is cute
Sharp-toothed grin	grin, sharp teeth	A sly grin

Rinka's tips

Don't use open mouth and closed mouth together. Pick only one mouth openness
Write symbol tags like :3 and :d exactly as they are, with no spaces before or after
Mouths get squashed when the face is small. Use upper body or portrait to show the face larger

For overall expression tags like smiling, embarrassed and crying: Facial Expression Prompt List (Smile, Blush, Crying) →

For eye shape and gaze tags: Eye Tags Guide: Eye Color, Eye Shape and Gaze Prompts →

Copy-paste templates

Just swap out the parts in [brackets]. The first is a smile with a fang and the second is a cat mouth.

1girl, solo, [hairstyle], [outfit], smile, open mouth, fang, skin fang, looking at viewer, upper body, simple background, masterpiece, best quality

1girl, solo, [hairstyle], [outfit], smug, :3, half-closed eyes, hand on own cheek, looking at viewer, portrait, masterpiece, best quality

FAQ

Frequently Asked Questions

What is the prompt for a snaggletooth fang?

fang is the tag for a single fang. For the anime-style drawing where the tooth pokes out from the mouth line, add skin fang as well. For fangs on both sides, use fangs.

How do I write a cat mouth (omega mouth)?

Use the tag :3. Write it as a symbol, with no spaces. Adding smug or half-closed eyes gives a mischievous face.

The mouth shape isn't showing up.

Mouth shapes get squashed when the face is small, so use upper body or portrait to show the face larger. It's also important to use only one mouth openness tag.