NGL not getting the results I wanted but it might be worth sharing. Trigger word is grillz. The trigger word has great effect at the beginning of the prompt. For best results be explicit about the subject (ethnicity, gender,...). Prompt templates below:

grillz. close-up of a [SUBJECT] laughing [LOCATION], showing a full silver grillz set on the upper teeth with a diamond-cut textured finish, natural teeth below

grillz. close-up of a [SUBJECT] smiling widely [LOCATION], showing a full gold grillz set on the upper and lower teeth, densely paved with round diamonds

grillz. close-up of a [SUBJECT]'s mouth with a full smooth, high-polish gold grillz set on the upper and lower teeth

grillz. close-up of a [SUBJECT] smiling [LOCATION], with two gold caps set with diamonds on the upper canines, flanking natural white front teeth

grillz. close-up of a [SUBJECT]'s open mouth showing a full two-tone grillz set, gold frames surrounding textured diamond-cut silver center panels

grillz. close-up of a [SUBJECT] smiling [LOCATION], showing a single gold cap on an upper front tooth, natural white teeth otherwise

grillz. close-up of a [SUBJECT]'s open mouth showing gold grillz with cutout letters spelling "[WORD]" across the front teeth

grillz. close-up of a [SUBJECT] smiling [LOCATION], with a gold [CHARM] charm cap on one tooth and a matching gold cap on another, natural teeth in between

grillz. close-up of a [SUBJECT]'s mouth showing a full grillz set with rectangular baguette-cut diamonds bordered by small round pave diamonds

grillz. close-up of a [SUBJECT] baring their teeth, showing a full gold grillz set with pointed, fang-like edges and a glossy finish

grillz. close-up of a [SUBJECT] smiling [LOCATION], with a gold cap set with a [COLOR] gemstone on an upper tooth, natural teeth around it

grillz. close-up of fingers pulling back a [SUBJECT]'s lip to reveal a full silver grillz set densely paved with diamonds

grillz. product photo of a full gold and diamond grillz set displayed on a white dental mold against a plain background

grillz. close-up of a [SUBJECT] smiling [LOCATION], showing a full silver grillz set with a matte, diamond-cut textured finish framed by smooth gold borders

grillz. close-up of a [SUBJECT]'s smile with a small diamond stud embedded in one natural tooth and a smooth gold cap on another