If i use steel tongue cleaner small taste bud like bumps removed. i can't clean the back side of tongue. it appear as red colour bumps. no painy, itchy.

I suggest: I suggest that you bring your tongue cleaner with you to a dentist, demonstrate how you use it and have him\her evaluate your tongue and what you're doing. You will get better answers and advice that way.

Brush top of tongue: We want you to clean the top of your tongue. It's not necessary to clean the side back portion of the tongue.