How to use "right" and "left" in a sentence?

[Dawood Usmani]

Hi Teachers!
could anyone please tell me how to use "right" and "left" in a sentence correctly? Are they a nouns, adjectives or adverbs? I'm really confused. Examples are always helpful.
Here are some sentences that will help you to understand my question. Which one is correct or grammatical and why?
1- Turn your face right and then left.
2- Turn your face to the right and then to the left.
3- Turn your face to the right side and then to the left side.
Explanation is very important for me please.
Best regards!
Dawood Usmani

[David L.]

1- Turn your face right and then left.
2- Turn your face to the right and then to the left.

'turn' here is being used as a phrasal verb, which is 'turn (something) to the..'
A doctor examining something about a person's face might say, for brevity, (1), but it would be understood that it is just a quick short form of (2), so use (2) only.

3- Turn your face to the right side and then to the left side.
To the right side of what? The sentence is asking the person to turn his face in relation to the right side of some specific external object. Just how one would actually do that I can't imagine. How do I "turn my face to the right side of the dog/door/school/John' ?
You would have to say, turn your face to its right side, but this is clumsy, awful, and unnecessary when one can just say (2) above.

[Dawood Usmani]

Thanks you very very much Davil L.
You've really been helpful. May God bless you!