Yeni bir diş macunu aldım; bu macunla dişlerimi fırçalamak ağzımı ferahlatıyor.

Here bir works like the English a/an: a new toothpaste.

So:

• yeni = new
• bir = a/an
• diş macunu = toothpaste

In Turkish, bir can also literally mean one, but in this sentence it is just the normal indefinite article-like word.

Yes, literally it is made from:

• diş = tooth
• macun = paste
• diş macunu = toothpaste

This is a very common Turkish noun compound pattern. The first noun describes the second noun.

A useful point: the full compound is diş macunu, not just a random pairing of two nouns. Turkish often builds everyday vocabulary this way.

Aldım comes from the verb almak = to take / to buy.

It breaks down like this:

• al- = verb stem
• -dı- = past tense
• -m = I

So aldım means I bought or I took, depending on context.
Here, with diş macunu, it clearly means I bought.

The semicolon links two closely related statements:

• Yeni bir diş macunu aldım
• bu macunla dişlerimi fırçalamak ağzımı ferahlatıyor

It is basically saying:

• I bought a new toothpaste;
• brushing my teeth with this toothpaste freshens my mouth.

In Turkish, punctuation works much like it does in English here. A period or sometimes a comma could also appear depending on style, but the semicolon neatly shows that the two parts are strongly connected.

Bu macunla means with this toothpaste or using this toothpaste.

Breakdown:

• bu = this
• macun = paste / toothpaste here
• -la = with

So macunla = with the toothpaste

This ending is often called the instrumental/comitative ending. It can mean:

• with
• by means of
• using

In this sentence, using this toothpaste is the most natural interpretation.

Because of vowel harmony, this ending can appear as -la or -le.

Dişlerimi breaks down into several parts:

• diş = tooth
• -ler = plural
• -im = my
• -i = accusative case

So dişlerimi means my teeth as a specific direct object.

Why all of that?

Because in dişlerimi fırçalamak:

• the teeth are plural
• they belong to me
• they are the thing being brushed, so they are the direct object

That is why Turkish stacks endings onto the noun.

The accusative ending marks a specific direct object.

Compare the idea:

• diş fırçalamak = to brush teeth, more general
• dişlerimi fırçalamak = to brush my teeth, specific

Since the sentence is talking about a particular set of teeth — my teeth — the accusative is natural.

This is a very common point for English speakers, because English does not mark direct objects this way.

Because here fırçalamak is functioning like brushing or to brush as a verbal noun / infinitive.

The structure is:

• bu macunla dişlerimi fırçalamak = brushing my teeth with this toothpaste
• ağzımı ferahlatıyor = freshens my mouth

So the whole infinitive phrase acts as the subject of the second clause.

A very literal reading would be:

• To brush my teeth with this toothpaste freshens my mouth.

More natural English would be:

• Brushing my teeth with this toothpaste freshens my mouth.

Ağzımı means my mouth as a specific object.

Breakdown:

• ağız = mouth
• -ım = my
• -ı = accusative
• due to sound changes, ağız + ım + ı becomes ağzımı

Turkish often explicitly marks possession with body parts:

• elimi yıkadım = I washed my hand(s)
• yüzünü gördüm = I saw your face
• ağzımı ferahlatıyor = it freshens my mouth

English often leaves this less marked, but Turkish usually includes the possessive ending.

Because in Turkish, possession on nouns is usually shown directly on the noun itself, especially with body parts and personal belongings.

So even if the speaker is already I, Turkish still naturally says:

• dişlerim = my teeth
• ağzım = my mouth

This is not redundant in Turkish; it is the normal grammar.

English can often rely on context, but Turkish usually prefers to mark this explicitly.

Ferahlatıyor comes from ferahlatmak, which means to freshen, to make feel fresh, or to refresh.

Breakdown:

• ferah = spacious, airy, fresh, relieved
• -lat- = a causative-type formation here, giving the sense to make fresh / to freshen
• -ıyor = present continuous / progressive

So ferahlatıyor means:

• is freshening
• freshens
• makes ... feel fresh

In this sentence, English usually translates it more naturally as freshens.

Also, Turkish -yor is often used not only for something happening right now, but also for general present statements like this one.

Turkish word order is often more verb-final than English.

The second clause is:

• bu macunla dişlerimi fırçalamak ağzımı ferahlatıyor

A rough word-for-word order is:

• with this toothpaste my teeth brushing my mouth freshens

This sounds strange in English, but it is normal in Turkish because:

• modifiers usually come before what they modify
• the main verb often comes at or near the end
• long subject phrases can come before the object and verb

So the structure is very Turkish, even though the English translation has to be rearranged.

Technically -la/-le can mean simple with, but in this context the natural meaning is using this toothpaste or with this toothpaste as an instrument.

So the sentence is not saying you are brushing your teeth alongside the toothpaste in some vague sense; it means the toothpaste is the thing you use for brushing.

This instrumental meaning is very common in Turkish.

Turkish often repeats a noun with a demonstrative like bu when referring back to it:

• Yeni bir diş macunu aldım. Bu macunla...
• I bought a new toothpaste. With this toothpaste...

This is completely natural and helps keep the reference clear.

In English, we might sometimes switch to it sooner, but Turkish often prefers repeating the noun, especially when introducing the next clause clearly.

Yes, a little.

Ferahlatıyor specifically suggests a feeling of freshness, relief, or cool/clean refreshment, especially with things like:

• toothpaste
• mint
• fresh air
• cold water

So it fits very well with mouth and toothpaste.

A phrase like iyi geliyor would mean something more general like feels good or is good for, but ferahlatıyor is more vivid and specific here.