yes. i have it in my mouth as we speak.

Most of the time they get sensitive because part of the tooth root is showing. Exposed root surface means that hot and cold feelings can reach the nerve of the tooth easier causing sensitivity from the nerve of the tooth. Brushing to hard, in the wrong direction or with whiting toothpaste can cause this sensitivity. This is not to be confused with pain when drinking or eating hot or cold things. Pain could indicate an infection in the nerve of a tooth. And needs to be treated with anti-biotics and root canal treatment or extraction.

because dentinoenamel junction locate between the two hard important part of the tooth and these two part of the tooth protect the tooth.

no they can not because your tooth is to sensitive and you will wake up