Gigi bongsu itu di sebelah gigi geraham.

Gigi bongsu means wisdom tooth.

It is made of:

• gigi = tooth / teeth
• bongsu = youngest

So literally, gigi bongsu is something like the youngest tooth, which is why it means wisdom tooth.

This is very common in Malay: a noun is followed by another word that describes or specifies it.

In Malay, demonstratives like ini (this) and itu (that) normally come after the noun.

So:

• gigi bongsu itu = that wisdom tooth / the wisdom tooth
• buku ini = this book
• rumah itu = that house

This is different from English, where this/that come before the noun.

It can often be understood as either, depending on context.

Literally:

• itu = that

But in natural Malay, ... itu can also help mark something as specific or already known, so in translation it may sound more natural as:

• that wisdom tooth
• or the wisdom tooth

Context decides which English version sounds best.

Malay often leaves out the verb to be in sentences like this.

So:

• Gigi bongsu itu di sebelah gigi geraham. literally follows the pattern:
• [noun phrase] + [location phrase]

Malay does not need a separate word for is here.

So the English idea:

• The wisdom tooth is beside the molar is expressed in Malay without an extra verb.

Di sebelah means beside, next to, or at the side of.

Breakdown:

• di = at / in / on
• sebelah = side

So di sebelah literally means something like at the side.

In this sentence:

• di sebelah gigi geraham = beside the molar

Depending on context, good translations include:

• beside
• next to
• by

Because this di is a preposition, not a verb prefix.

In Malay:

• di as a preposition is written separately
• di- as a passive verb prefix is written attached

Examples:

• di sebelah = beside
• di rumah = at home
• dibuka = opened
• ditulis = written

So in di sebelah, it must be separate.

Gigi geraham means molar.

It is literally:

• gigi = tooth
• geraham = molar / grinding tooth

Malay often uses full noun phrases like this, even when English would use a single word. So repeating gigi is normal.

That means:

• gigi bongsu = wisdom tooth
• gigi geraham = molar

Malay is being explicit about both of them being types of teeth.

Because gigi geraham can be understood generically or from context.

So:

• di sebelah gigi geraham = beside the/a molar

If you want to specify a particular molar, you can say:

• di sebelah gigi geraham itu = beside that molar

So the original sentence does not necessarily point to one very specific molar unless the context already makes it clear.

No. It is a common and natural way, but not the only one.

Other possible expressions include:

• bersebelahan dengan = adjacent to / next to
• di samping = beside / at the side of

For example:

• Gigi bongsu itu bersebelahan dengan gigi geraham.

That said, di sebelah is simple, common, and very useful.

Yes. It is very normal.

The structure is:

• Gigi bongsu itu = subject noun phrase
• di sebelah gigi geraham = location phrase

So the pattern is basically:

• [thing] + [location]

This is a very common Malay sentence pattern.

Yes. Malay nouns usually do not change form for singular and plural.

So gigi can mean:

• tooth
• teeth

Usually context tells you which one is meant.

In this sentence, because of bongsu and geraham, the meaning is clearly singular in English:

• wisdom tooth
• molar

A natural translation would be:

• That wisdom tooth is next to the molar.

Other natural possibilities:

• The wisdom tooth is beside the molar.
• That wisdom tooth is beside the molar.

The best choice depends on context, especially how specifically you want to translate itu.

A simple pronunciation guide is:

• Gigi ≈ gee-gee
• bongsu ≈ bong-soo
• itu ≈ ee-too
• di sebelah ≈ dee suh-buh-lah
• gigi geraham ≈ gee-gee guh-rah-ham

A few helpful notes:

• Malay g is always a hard g, like in go
• i is usually like ee
• u is usually like oo
• Stress in Malay is generally not as strong or dramatic as in English

So the full sentence sounds roughly like:

gee-gee bong-soo ee-too dee suh-buh-lah gee-gee guh-rah-ham