JC - My husband's radiation oncologist (RO) recommended that he have his lower teeth only pulled. His teeth were not in the greatest of shape - no active cavities or anything, but he had had a lot of dental work earlier in his life and had splints in his lower jaw area holding his teeth in. Anyway, the reason the RO said the lower teeth only, was because he said the upper teeth are fed by a separate blood supply than the lower ones, and that having future dental work on the upper teeth does not usually pose a problem as far as the bone not healing. So my husband did have his remaining lower teeth removed. You may want to have your brother ask them to spare his upper teeth if they are in decent shape and if in fact his doctors agree with what was told to us. Upper teeth are better than no teeth. My husband survived his radiation and chemo treatments and a radical neck dissection following that, and is recuperating now. Wish I could say that he is eating, but he hasn't regained the desire to eat yet and is still using a feeding tube. Has some problems with nausea on and off as well, but overall, he is much better. best of luck to your brother.
Michele