sikaeiseisi ga maeba no hanarabi wo kakuninsimasu.

A natural reading is:

しかえいせいし が まえば の はならび を かくにんします。

Word by word:

• 歯科衛生士 = しかえいせいし
• が = が
• 前歯 = まえば
• の = の
• 歯並び = はならび
• を = を
• 確認します = かくにんします

The structure is:

[subject] が [object] を [verb]

So here:

• 歯科衛生士 が = the dental hygienist
• 前歯の歯並び を = the alignment of the front teeth
• 確認します = checks / will check

This is a very standard Japanese sentence pattern.

が marks the grammatical subject of the sentence.

So 歯科衛生士が means the dental hygienist is the one doing the action.

In this sentence, が simply identifies who performs 確認します.

A learner often compares が and は here:

• 歯科衛生士が前歯の歯並びを確認します。
  = It is the dental hygienist who checks the alignment.

• 歯科衛生士は前歯の歯並びを確認します。
  = As for the dental hygienist, they check the alignment.

Both can be possible in different contexts, but が is fine for introducing or identifying the subject straightforwardly.

の connects nouns and often shows a relationship like of, 's, or belonging to.

Here:

• 前歯 = front teeth
• 歯並び = tooth alignment / arrangement of teeth

So:

前歯の歯並び = the alignment of the front teeth

It tells you which alignment is being checked: not all teeth in general, but specifically the alignment of the front teeth.

Because they mean different things:

• 前歯 = front teeth
• 歯並び = alignment or arrangement of the teeth

So 前歯の歯並び is not repetitive in Japanese. It means something like:

• the alignment of the front teeth
• how the front teeth are lined up

Even though both include the idea of teeth, they play different roles in the phrase.

歯並び literally refers to how the teeth are lined up.

It can mean:

• tooth alignment
• arrangement of the teeth
• how straight or uneven the teeth are

You will often hear it in dental contexts, especially when talking about braces, bite, or cosmetic appearance.

Examples:

• 歯並びがいい = having well-aligned teeth
• 歯並びが悪い = having poor/crooked alignment

を marks the direct object of the verb.

The thing being checked is 前歯の歯並び, so that noun phrase takes を:

前歯の歯並びを確認します
= checks the alignment of the front teeth

A helpful way to see it:

• subject: 歯科衛生士
• object: 前歯の歯並び
• verb: 確認します

確認します means to check, to confirm, or to inspect.

In medical, dental, or professional settings, 確認します sounds more appropriate and precise than 見ます.

Compare:

• 見ます = look at / see
• 確認します = check carefully / confirm

So in a clinic, 確認します is the more natural choice because the hygienist is not just looking casually—they are examining or checking something.

In Japanese, the -ます form can express both present and future, depending on context.

So 確認します can mean:

• checks
• will check
• is going to check

In a dental or hospital setting, it often means something like:

• The dental hygienist will check the alignment of your front teeth.
• The dental hygienist checks the alignment of the front teeth.

The exact English tense depends on the situation.

Yes. 確認します is in the polite non-past -ます form.

The plain form is:

• 確認する

So:

• 確認します = polite
• 確認する = plain / dictionary form

In medical and customer-facing situations, the polite form is very common and expected.

By itself, 歯科衛生士 does not show singular or plural.

It can mean:

• a dental hygienist
• the dental hygienist
• dental hygienists

Japanese usually does not mark plural unless it needs to. The context tells you whether it is one person or more than one.

In this sentence, English will usually translate it as the dental hygienist or a dental hygienist.

Japanese does not have articles like a, an, or the.

So 歯科衛生士 can mean:

• a dental hygienist
• the dental hygienist

And 前歯の歯並び can mean:

• the alignment of the front teeth
• front-tooth alignment

English requires articles, but Japanese usually leaves that information to context.

Yes, Japanese word order is more flexible than English, as long as the particles stay attached to the right words.

For example, this is also possible:

前歯の歯並びを歯科衛生士が確認します。

This still means basically the same thing, because:

• が still marks the subject
• を still marks the object

However, the original order is very natural and easy to follow.

Yes, very often.

If the context already makes it clear that the dental hygienist is the one acting, Japanese may simply say:

前歯の歯並びを確認します。

This would still be natural, especially in a clinic where the speaker's role is obvious.

Japanese often drops information that is understood from context, including the subject.

Not exactly, though they can overlap in meaning.

• 前歯 literally means front teeth
• In some contexts, English might translate that as incisors, but front teeth is the more direct and natural meaning

So for learners, it is best to understand 前歯 as front teeth unless a more technical dental translation is needed.

A fairly literal breakdown is:

• 歯科衛生士が = the dental hygienist
• 前歯の歯並びを = the alignment of the front teeth
• 確認します = checks / will check

So the literal sense is:

The dental hygienist checks the alignment of the front teeth.

This is a good example of how Japanese builds meaning with noun phrases first and puts the verb at the end.