haisya ga rentogen wo torimasu.

が marks the grammatical subject of the sentence: the person who performs the action.

So in:

歯医者がレントゲンを撮ります。

the dentist is the one who takes the X-ray.

Using は would change the nuance a little. 歯医者はレントゲンを撮ります sounds more like as for the dentist, they take X-rays or the dentist will take the X-ray with the dentist as the topic. Both can be possible depending on context, but が is a very natural way to identify who is doing the action.

を marks the direct object, meaning the thing directly affected by the verb.

Here:

• レントゲン = X-ray
• を = marks it as the object
• 撮ります = takes

So レントゲンを撮ります means take an X-ray.

In other words, the X-ray is the thing being taken.

Yes—撮る（とる） is the verb commonly used for taking photographs, videos, and also medical images like X-rays.

So Japanese treats this similarly to taking a picture:

• 写真を撮る = take a photo
• レントゲンを撮る = take an X-ray

This is very natural Japanese. Even though in English we might think of an X-ray as a medical procedure rather than a picture, Japanese still uses the same basic verb.

It is read とります.

The dictionary form is 撮る（とる）, and 撮ります is the polite -ます form.

So:

• 撮る = plain form
• 撮ります = polite form

レントゲン means X-ray.

It is a loanword written in katakana. Interestingly, it comes from the name Röntgen, the scientist associated with the discovery of X-rays, rather than from the English word X-ray.

In everyday Japanese, レントゲン commonly refers to:

• an X-ray image
• an X-ray examination
• sometimes the act of taking the X-ray, depending on context

So in this sentence, it means the dentist takes an X-ray.

It can mean either, depending on context.

• 歯医者 can mean a dentist (the person)
• It can also mean the dentist's office / dental clinic in casual speech

But in this sentence, because it is followed by が, it is being treated as the subject who performs the action, so it means the dentist.

If you wanted to say at the dentist's office, you would more naturally use something like:

• 歯医者でレントゲンを撮ります。 = They will take an X-ray at the dentist's office.

So 歯医者が = the dentist does it
while 歯医者で = it happens at the dentist's office

Japanese often leaves out information that is understood from context.

In a situation like this, the listener can easily guess that the patient is the one receiving the X-ray, so Japanese does not need to mention it explicitly.

English often prefers to say something like:

• The dentist will take an X-ray of you.
• The dentist is going to take your X-ray.

But Japanese can simply say:

歯医者がレントゲンを撮ります。

The patient is understood from the situation.

If needed, Japanese could make it explicit, for example:

• 歯医者があなたのレントゲンを撮ります。 = The dentist will take your X-ray.

But that is often unnecessary.

Yes. 撮ります is polite -ます form, so the sentence is polite in a normal, standard way.

It is appropriate in many everyday situations, such as:

• speaking to a patient
• explaining a procedure
• making a simple statement politely

A plain-form version would be:

• 歯医者がレントゲンを撮る。

That sounds less polite and more casual or dictionary-like.

No, normal Japanese is usually written without spaces.

The standard written sentence would be:

歯医者がレントゲンを撮ります。

Spaces are often added in beginner materials to make the structure easier to see.

So the spaced version is just a learning aid.

Yes, depending on context.

Japanese does not mark singular vs. plural the way English does, and present/future forms can be flexible.

So 歯医者がレントゲンを撮ります could mean things like:

• The dentist will take an X-ray.
• The dentist takes X-rays.
• The dentist is going to take the X-ray.

The exact meaning depends on the situation.

In a clinic situation, it will often mean something like The dentist will take an X-ray or The dentist is going to take your X-ray.

Yes. 歯医者さん is very common and sounds a little warmer or more natural in everyday conversation when referring to a dentist.

So you may hear:

歯医者さんがレントゲンを撮ります。

That sounds very natural.

The version without さん is not wrong at all, but 歯医者さん is often more common in speech when talking about a specific dentist in a friendly or neutral way.

Yes. Japanese has several verbs pronounced とる, but they use different kanji and have different meanings.

For example:

• 撮る = take a photo / video / X-ray
• 取る = take, get, remove, obtain
• 採る = pick, gather, adopt
• 捕る = catch

For an X-ray, 撮る is the correct verb, because it is treated like taking an image.

So:

• レントゲンを撮る = correct and natural

That is the form you should learn here.