Can a untreated tooth pain cause a lip twitch intermittent does the nerves connected to the lip? same side

Possibly: Possibly this could be caused by a muscle spasm that refers pain into the tooth or area of the tooth, and also could be causing the lip twitching. The concept of referred pain from muscles was studied extensively by the famous physician dr. Janet travell, so google. If this seems far fetched I have actually seen this happen. To be best served be sure that this is not really coming from a tooth.

Yes and yes: Sensory nerves to the teeth also go to the lip. Twitch not uncommon . Your body is telling you that you have an untreated infection that will only get worse, hurt more, and will spread to bone, gums, lymph nodes, etc. Get it treated now rather than dealing with the consequences. It will not get better by itself.

Twitch in lip: Unresolved tooth pain is a sign that something needs attention. If you were experiencing the pain prior to the twitch this could be a good indication of the situation worsening. You need to see your dentist asap to have this evaluated and treated.

Not common: Not common but possible. Best way to find out is to treat tooth and see if twitch goes away.