Ясна навколо зубів.

Not really. By itself, it sounds more like a phrase, label, or heading than a full sentence.

A full Ukrainian sentence would usually include a verb, for example:

• Ясна навколо зубів запалені. = The gums around the teeth are inflamed.
• Ясна навколо зубів болять. = The gums around the teeth hurt.

So the given text is best understood as a noun phrase: gums around the teeth.

Here, ясна is a noun meaning gums.

That can be confusing, because ясна can also be an adjective form from ясний and mean something like clear or bright, depending on context.

In this phrase, though, навколо зубів makes it clear that ясна means gums.

Because Ukrainian normally talks about gums as a plural noun, just like English often does.

So:

• ясна = gums

Learners sometimes expect a singular form like English gum, but in ordinary Ukrainian, ясна is the normal everyday word.

Because Ukrainian plural nouns do not always end in -и or -і.

Some nouns have plural forms in -а / -я, and ясна is one of those standard forms. So even though it ends in -а, it is still plural here.

This is something you mostly learn word by word at first.

Because навколо requires the genitive case.

The basic noun is:

• зуб = tooth

Its genitive plural form is:

• зубів = of teeth

So:

• навколо зубів = around the teeth / around teeth

That is why зуби is not used here.

Навколо means around.

In this phrase, it works as a preposition and is followed by the genitive case:

• навколо зубів = around the teeth

So the structure is:

• ясна = gums
• навколо зубів = around the teeth

Together: the gums around the teeth.

Because Ukrainian has no articles.

So Ukrainian does not have separate words for a, an, or the. Whether something is the teeth, teeth, or some teeth is understood from context.

That means зубів can be interpreted as teeth or the teeth, depending on the situation.

Then зубів would become зуба, the genitive singular form of зуб.

So:

• навколо зуба = around the tooth / around a tooth

And the whole phrase would be:

• Ясна навколо зуба = gums around the tooth

Yes, Ukrainian word order is fairly flexible, but this order is the most natural if you are simply naming or describing the area.

• Ясна навколо зубів = neutral, straightforward

If you change the order, it may sound more marked, poetic, or context-driven. For a simple label or anatomical description, the original order is the safest choice.