I chew on the inside of my mouth and toung, i tried chewing gum but dentist said no! its a nervous habbit any recommendations to quit this bad habbit?

Nervous habit: Some time there is no remedy you may find . However faith in god, daily prayer to give up this habit, meditation. Make you stronger. Try and you will get the result.

Possibly a BFRB?: These could be body-focused repetitive behaviors (bfrbs) - like hair pulling & nail biting. Bfrbs can arise in response to (a) emotions (anxiety, fear, boredom, excitement); &/or (b) sensing rough areas skin (like inside of cheek/on tongue). Bfrbs can feel pleasurable & can serve 2 relieve tension. Helpful behavioral treatments available. A clinical psychologist who specializes in bfrbs can help.