המסטיק הזה בלי סוכר, אבל רופאת השיניים עדיין אומרת שלא טוב לאכול מסטיק כל היום.

In Hebrew, when you say this/that + noun, the usual pattern is:

• noun + demonstrative
• המסטיק הזה = this gum
• הספר הזה = this book

Also, the noun usually takes ה־ when it is definite.

By contrast, זה המסטיק usually means something more like this is the gum or this is the specific gum, so it works more like a full sentence, not just a noun phrase.

Yes. מסטיק is treated as a masculine singular noun, so it takes the masculine singular demonstrative:

• הזה = masculine singular
• הזאת = feminine singular

So:

• המסטיק הזה = correct
• המסטיק הזאת = incorrect

בלי means without.

So בלי סוכר means without sugar / sugar-free.

There is no ה־ on סוכר because this is talking about sugar in a general sense, not a specific sugar. Compare:

• בלי סוכר = without sugar
• בלי הסוכר = without the sugar

The second version would only make sense in a very specific context.

Yes. רופאת שיניים / רופאת השיניים is a common way to say female dentist.

Literally, it is built from:

• רופאה = female doctor
• שיניים = teeth

In the construct form, רופאה becomes רופאת.

So:

• רופאת שיניים = a female dentist
• רופאת השיניים = the female dentist

If the dentist were male, you would normally get:

• רופא שיניים = a male dentist / dentist
• רופא השיניים = the male dentist

Because this is a construct chain (called סמיכות in Hebrew).

In a construct chain, the first noun usually does not take ה־. Definite marking appears on the second noun instead.

So:

• רופאת שיניים = a dentist
• רופאת השיניים = the dentist

You do not say הרופאת השיניים.

This is a very common Hebrew pattern:

• בית ספר = a school
• בית הספר = the school

That is just the normal Hebrew expression. Hebrew says tooth doctor using teeth in the plural:

• רופא/רופאת שיניים

English uses dentist, but Hebrew often builds professions this way. So even though it sounds more literal to an English speaker, it is the standard expression.

עדיין means still.

In this sentence, it comes after the subject and before the verb:

• רופאת השיניים עדיין אומרת

That placement is very natural. Hebrew word order is somewhat flexible, but this is a common and neutral position for adverbs like עדיין.

שלא here is made of two parts:

• ש־ = that
• לא = not

So:

• אומרת שלא טוב = says that it’s not good

This is a very common Hebrew structure after verbs like say, think, know, etc.

For example:

• הוא אומר ש... = he says that...
• הוא אומר שלא... = he says that not...

It is not written, because Hebrew usually omits the present-tense form of to be.

So:

• טוב = good
• לא טוב = not good

Even though English needs is in many cases, Hebrew usually does not say it in the present tense.

So שלא טוב literally looks like that not good, but it means that it is not good.

Because מסטיק here is being used generically, not as a specific definite object.

• לאכול מסטיק = to eat/chew gum in general
• לאכול את המסטיק = to eat the gum / a specific piece of gum

Hebrew uses את only before a definite direct object. Since this is a general statement about gum, there is no את.

A learner might expect ללעוס מסטיק because ללעוס means to chew, and that is indeed the more precise verb.

However, speakers may sometimes use לאכול more loosely in everyday speech when talking about consuming or having something in the mouth. In many contexts, ללעוס מסטיק would sound more exact, but לאכול מסטיק is understandable and may appear in casual usage or simplified language.

So the key point is:

• ללעוס מסטיק = more precise
• לאכול מסטיק = understandable, sometimes used more loosely

כל means all or every, and in this expression:

• כל היום = all day / the whole day

This is a very common pattern in Hebrew:

• כל היום = all day
• כל הלילה = all night
• כל השבוע = all week
• כל הזמן = all the time

So here it means the action happens throughout the day, not just once.

אבל means but.

It connects the two contrasting parts of the sentence:

• the gum is sugar-free
• but the dentist still says it is not good to eat/chew gum all day

Its placement is very similar to English: it comes at the start of the second clause.

So the structure is straightforward:

• statement 1 + אבל
  • statement 2