keep my teeth clean

I went to the dentist and had my teeth cleaned.
my concern was the tooth under the right side.
the tooth has not grown up enough.
I had always trouble with brushing it.

I was wondering if I should pull it out.
but the dentist said I don't need to .
I just have to make efforts to brush it completely.

the little tooth will live with me forever.
I will do my best to keep it clean.