jeoneun achimmada yangchihaeyo.

저는 means as for me or simply I as the topic of the sentence.

• 저 = humble/polite I
• 는 = topic particle

So 저는 sets up me as the topic: As for me, ...

Why not 저가? In most everyday sentences like this, 는 is more natural because you are just stating a general habit about yourself. 가 would sound more like you are specifically identifying who does it, often with contrast or new information.

So:

• 저는 아침마다 양치해요. = I brush my teeth every morning. / As for me, I brush my teeth every morning.

Also, in conversation, 저는 is often omitted if the subject is already clear:

• 아침마다 양치해요.

Yes, 아침마다 means every morning.

It is built like this:

• 아침 = morning
• 마다 = every, each

So:

• 아침마다 = every morning
• 주말마다 = every weekend
• 해마다 = every year

A useful nuance: 마다 emphasizes each and every instance of something. So 아침마다 strongly gives the idea of a repeated habit.

Yes, basically. 양치해요 comes from 양치하다, which means to brush one's teeth.

Breakdown:

• 양치 = tooth brushing / dental brushing
• 하다 = to do

So 양치하다 literally means to do tooth brushing, but in natural English it is just to brush one's teeth.

The form 양치해요 is the polite present tense:

• 양치하다 → 양치해요

In Korean, 양치하다 already strongly implies brushing your teeth, so the object is often omitted.

That is why:

• 저는 아침마다 양치해요. sounds completely natural.

You may also hear:

• 이를 닦아요. = I brush my teeth.
  • 이 = tooth/teeth
  • 닦다 = to clean/brush

Important note: 이를 양치해요 is not the usual way to say it. If you want to include teeth, Korean more naturally says:

• 이를 닦아요.

So:

• 양치해요 = natural on its own
• 이를 닦아요 = also natural
• 이를 양치해요 = unnatural or much less standard

Great question. This is due to Korean verb contraction.

The base verb is:

• 양치하다

To make it polite present tense, you add -아요/어요:

• 양치하다
  • -아요

But 하다 + 아요 contracts:

• 하여요 → 해요

So:

• 양치하다 → 양치해요

This same pattern appears in many 하다 verbs:

• 공부하다 → 공부해요
• 일하다 → 일해요
• 운동하다 → 운동해요

Yes, 양치해요 is in the present tense, but in Korean, the present tense often covers:

• actions happening now
• general habits
• repeated routines

So 저는 아침마다 양치해요. naturally means a habitual action:

• I brush my teeth every morning.

This is very similar to English simple present for routines:

• I eat breakfast every day.
• I go to work on weekdays.

Yes, but the nuance is slightly different.

• 아침에 양치해요. = I brush my teeth in the morning.
• 아침마다 양치해요. = I brush my teeth every morning.

So:

• 아침에 focuses on the time: in the morning
• 아침마다 emphasizes repetition: every morning

If you want to clearly express a regular habit, 아침마다 is stronger.

양치해요 is in the standard polite -요 style. It is very common and appropriate for most everyday situations.

Other levels:

• 양치해. = casual/informal, used with close friends, younger people, etc.
• 양치합니다. = formal, more stiff or official

Examples:

• 나 아침마다 양치해. = casual
• 저는 아침마다 양치합니다. = formal
• 저는 아침마다 양치해요. = polite everyday speech

Yes. Korean often omits the subject when it is understood from context.

So all of these can work:

• 저는 아침마다 양치해요.
• 아침마다 양치해요.

The second one is very common in conversation if it is already obvious that you are talking about yourself.

Korean frequently drops subjects and objects when they are clear, so learners should get used to that pattern.