Do you think that me getting an x -ray done at the orthodontist would show of any possible brain tumors?

Doubtful: Dental radiographs are for the teeth and jaws, including the sinuses. A lateral ceph will image part of your skull, but is not intended to image the brain. Even if it did, i sincerely doubt that your orthodontist would be qualified to read the film and diagnose a brain tumor.

Extremely unlikely: Perhaps a very large tumor (likely already causing symptoms) could be suggested on a lateral radiograph of the jaw, but never on bitewing x-rays.

Probably not: While the majority of the brain case is viewable on an orthodontic cephalometric x-ray, density is adjusted to show the bone around the brain, not the brain itself.

Possibly: Normal xrays will not, however, if one gets a computerized axial tomotgraphic scan -that can pick up pathology.

No: Most tumors would not show on any xray done at an orthodontist's office. Different imaging techniques are needed to visualize brain tumors.

Likely not: There are more detailed, higher resolution scans that are typically done for this-- and the people looking at the x-rays are not looking for this. That said, its not impossible and if someone thinks they saw something unusual, its definitely cause for following up and seeing a specialist.