אני כל כך לחוצה, שבזמן שאני מצחצחת שיניים עם משחת השיניים החדשה, אני חושבת רק על הפגישה.

Because לחוצה is the feminine singular form of the adjective.

Hebrew adjectives must agree with the person or thing they describe in:

• gender
• number

So if the speaker is a woman, she says:

• אני לחוצה = I am stressed / tense

If the speaker is a man, he would say:

• אני לחוץ

The same agreement shows up later in the sentence too:

• מצחצחת
• חושבת

Both of those are also feminine singular forms.

כל כך means so or so much.

In this sentence:

• אני כל כך לחוצה = I’m so stressed

A very common pattern in Hebrew is:

• כל כך ... ש...
• so ... that...

So the sentence is built like:

• אני כל כך לחוצה, ש...
• I’m so stressed that...

This is very similar to English.

Here ש means that.

So:

• אני כל כך לחוצה, ש... = I’m so stressed that...

Then the rest of the clause explains the result:

• שבזמן שאני מצחצחת שיניים... אני חושבת רק על הפגישה = that while I’m brushing my teeth... I’m thinking only about the meeting

So שבזמן is really:

• ש + בזמן
• that + while / at the time that

Hebrew often attaches ש directly to the next word.

בזמן שאני means while I am or more literally at the time that I am.

Breakdown:

• בזמן = during the time / while
• שאני = that I am

So:

• בזמן שאני מצחצחת שיניים = while I’m brushing my teeth

This is a very common way to say while in Hebrew.

Both are possible, but they are not used in exactly the same way.

In this sentence:

• מצחצחת שיניים literally means brushing teeth

This is a very natural, general expression in Hebrew, similar to English brush my teeth even though Hebrew does not explicitly say my here.

You can also hear:

• מצחצחת את השיניים = brushing the teeth

That version sounds a bit more explicit and concrete.

So:

• לצחצח שיניים = a common general expression, like to brush one’s teeth
• לצחצח את השיניים = also correct, often a bit more specific

Because Hebrew often leaves possession understood when it is obvious from context.

In English, you usually say:

• I’m brushing *my teeth*

In Hebrew, it is very natural to say simply:

• אני מצחצחת שיניים

The listener understands that you mean your own teeth unless context suggests otherwise.

This happens with some body-related actions and routine activities.

מצחצחת is the feminine singular present-tense form of the verb:

• לצחצח = to brush / polish

So:

• אני מצחצחת = I am brushing (said by a woman)
• אני מצחצח = I am brushing (said by a man)

The root is usually given as:

• צ-ח-צ-ח

In this sentence, it means brushing teeth.

Because Hebrew often uses a construct phrase to express combinations like this.

So:

• משחה = paste
• שיניים = teeth

Together:

• משחת שיניים = toothpaste literally: paste of teeth

When made definite:

• משחת השיניים = the toothpaste

This is a very common Hebrew structure. Similar examples:

• בית ספר = school (literally house of book)
• מברשת שיניים = toothbrush (literally brush of teeth)

This is because משחת השיניים החדשה is a definite noun phrase: the new toothpaste.

In a construct phrase like:

• משחת שיניים = toothpaste

the definiteness is usually shown on the second noun:

• משחת השיניים = the toothpaste

Then, if you add an adjective, the adjective must also be definite:

• משחת השיניים החדשה = the new toothpaste

So:

• השיניים makes the whole construct phrase definite
• החדשה agrees with that definite noun phrase

This can feel strange to English speakers, but it is standard Hebrew grammar.

Because the adjective must agree with משחה, and משחה is:

• feminine
• singular
• definite

So the adjective must also be:

• feminine singular definite

That gives:

• החדשה = the new

Compare:

• משחה חדשה = a new paste / a new toothpaste
• משחת השיניים החדשה = the new toothpaste

Even though שיניים is plural, the adjective agrees with משחה, not with שיניים.

Hebrew often repeats the subject pronoun for clarity, especially in longer sentences.

So:

• ...בזמן שאני מצחצחת שיניים... אני חושבת...

Literally:

• while I am brushing my teeth... I am thinking...

In English, we also often repeat I in a sentence like this, so it should not feel too unusual.

The second אני helps clearly start the main clause again after the time clause.

רק means only.

So:

• אני חושבת רק על הפגישה = I’m thinking only about the meeting

Placing רק before על הפגישה means that the thing she is thinking about is limited to the meeting.

So the focus is:

• only about the meeting not about anything else.

Because the verb לחשוב often takes the preposition על when it means to think about something.

So:

• לחשוב על משהו = to think about something

Examples:

• אני חושבת על העבודה = I’m thinking about work
• הוא חושב על החופשה = He’s thinking about the vacation

So:

• אני חושבת רק על הפגישה = I’m only thinking about the meeting

This is just the normal preposition used with this meaning.

חושבת is the feminine singular present-tense form of:

• לחשוב = to think

So:

• אני חושבת = I think / I am thinking (said by a woman)
• אני חושב = I think / I am thinking (said by a man)

In Hebrew, the present tense can often translate as either:

• simple present: I think
• present progressive: I am thinking

Here, because of the context, English would usually say:

• I’m thinking

Because it means the meeting, not just a meeting.

So:

• פגישה = a meeting
• הפגישה = the meeting

The speaker is referring to a specific meeting already known from context.

That is why the sentence says:

• על הפגישה = about the meeting

It is understandable and grammatical, but it is somewhat long and a little heavy because it packs in a lot of information.

The pattern itself is natural:

• אני כל כך לחוצה ש...

But since it contains:

• an emotion
• a time clause
• a toothpaste phrase
• a thought clause

it feels a bit elaborate.

A more everyday version might be something like:

• אני כל כך לחוצה, שגם כשאני מצחצחת שיניים עם משחת השיניים החדשה, אני חושבת רק על הפגישה.

Using גם כש... can sound slightly more natural in the sense of:

• I’m so stressed that even when I brush my teeth...

But the original sentence is still perfectly understandable.

The commas help separate the clauses.

Structure:

• אני כל כך לחוצה,
• שבזמן שאני מצחצחת שיניים עם משחת השיניים החדשה,
• אני חושבת רק על הפגישה.

So the commas mark:

1. the end of the main emotional statement
2. the end of the inserted time clause

Hebrew punctuation in modern writing is often similar to English punctuation in long sentences like this.

Yes. A common simpler option is:

• כשאני = when / while I’m

So:

• כשאני מצחצחת שיניים = when / while I brush / am brushing my teeth

This is often more conversational.

The original:

• בזמן שאני can sound slightly more formal or explicit than כשאני.

Both are correct.