tumemono ga arimasen.

It is read つめもの.

• 詰める（つめる） = to stuff, fill, pack
• 物（もの） = thing

So 詰め物 literally means a filled/stuffed thing or filling/stuffing, depending on context.

が marks what exists / does not exist in sentences with ある or いる.

So in:

• 詰め物 が ありません。

the が marks 詰め物 as the thing that is absent.

This is very common in Japanese:

• 時間がありません。 = There is no time.
• お金がありません。 = I don’t have money. / There is no money.
• 問題がありません。 = There is no problem.

Even though English often says I don’t have..., Japanese often uses an existence pattern instead.

Because 詰め物 is an inanimate thing, not a person or animal.

Japanese uses:

• ある / ありません for things
• いる / いません for people and animals

So:

• 詰め物がありません。 = correct
• 詰め物がいません。 = incorrect, because 詰め物 is not animate

The dictionary form is ある.

The pattern is:

• ある = there is / to have
• ありません = there is not / do not have

This is the polite negative form.

A casual version would be:

• 詰め物がない。

A polite-but-less-formal version often heard in conversation is:

• 詰め物がないです。

It can mean either, depending on context.

That is because Japanese often leaves the larger context unstated. So 詰め物がありません could mean:

• a filling/stuffing is not present
• someone does not have a filling
• there are no fillings available
• there is no stuffing inside something

The exact interpretation depends on the situation.

For example:

• at a dentist: There is no filling
• talking about a pillow or dumpling: There is no stuffing/filling inside
• in a store or supply context: We don’t have any filling

Japanese very often omits subjects and other information when they are understood from context.

So instead of saying something like:

• 私は詰め物がありません。
  As for me, I don’t have a filling.

Japanese will often just say:

• 詰め物がありません。

if the listener already knows who or what is being talked about.

This is one of the most common differences from English.

Yes, but the nuance changes.

• 詰め物がありません。 = simply states that there is no filling
• 詰め物はありません。 = as for the filling, there isn’t one / there is no filling, though perhaps something else exists

Using は can add contrast or topic emphasis.

For example:

• 詰め物はありませんが、かぶせ物はあります。
  There is no filling, but there is a crown.

So が is the more neutral choice for simple existence/non-existence.

Japanese nouns usually do not show singular vs. plural by themselves.

So 詰め物 can mean:

• a filling
• fillings
• stuffing
• some filling material

You determine the number from context.

So 詰め物がありません could mean:

• There is no filling.
• There are no fillings.

Not always. 詰め物 is a general word for stuffing, filling, packed material, or something inserted to fill a space.

Depending on context, it could refer to things like:

• a dental filling
• the filling inside food
• stuffing inside an object
• other material used to fill a space

So the sentence itself is grammatically general, even if your specific context gives it one clear meaning.

The casual version is:

• 詰め物がない。

Other possible spoken variants are:

• 詰め物ない。
  Very casual, often heard in conversation
• 詰め物がないです。
  Casual-polite spoken style

The original:

• 詰め物がありません。

is polite and appropriate in formal or neutral situations.

Because Japanese often expresses possession through existence.

For example:

• お金があります。
  Literally: money exists
  Natural meaning: I have money.

• お金がありません。
  Literally: money does not exist
  Natural meaning: I don’t have money.

So 詰め物がありません follows the same pattern. Japanese is often framing the idea as the thing is absent, rather than directly saying I don’t have the thing.