I have bad teeth and was wondering if the bad teeth could cause
Headache ,neck pain and dizziness also drowsiness

Yes, and infections that can lead to even worst

Bad teeth, and especially a bad bite, can cause all sorts of problems. Headaches, neck pain, migraines, jaw pain, even sometimes back pain can often be linked to a bad bite. If you are having problems you should consider seeing a dentist and an orthodontist to address your concerns. Usually simple orthodontic treatment can take care of the problems you describe.

It depends on how your teeth are bad. Are they bad with cavities or are they bad because they are crooked?