Tooth / Teeth

[jack]

What do these mean?

1. Did you get a tooth check-up?
2. Did you get a teeth check-up?

[Mister Micawber]

They mean, 'did you have a dental examination?'

[jack]

Thanks.

What does it mean when I use 'teeth' instead of 'tooth' and vice versa?

[Casiopea]

Thanks.

What does it mean when I use 'teeth' instead of 'tooth' and vice versa?

I agree with MM. Use "dental".

By the way, adjectives do not carry inflectional endings. Plural -s and other plural variants (i.e., vowel mutation: foot, feet, tooth, teeth) are inflectional.

"tooth" functions as an adjective, "teeth" does not:

I have a toothache.
I have a *teethache.

I have a football.
I have a *feetball.

But,

I have a tooth appointment. (specifically one tooth)
I have a teeth appointment. (more than one tooth)

Meaning, I have an appointment for my tooth/teeth.

"I have a dental check-up" (one tooth or more)
"I have a tooth check-up" (specifically one tooth)