Why does my tongue keep pushing against my tooth, andhow can i stop it? i used to bite my tongue, but now my tongue pushes up against my molar, hurts.

Overbite?: Unless your tongue is swollen, this sounds like you may need your bite adjusted for mal alignment. Suggest you see an orthodontist ASAP and have a good exam and dental films to evaluate

May need to see ENT: An ENT physician can help clarify this. You can ask your physician if you can see one. The tongue can be sore for a variety of reasons, including nutrition, infection.

Voluntary: This must be a voluntary motion you're making with your tongue and it might have become a habit. To be sure,have your dentist check and advise you. He/she will also examine your tongue.