I use Prevident 5000, but using that PLUS trays seems like serious overkill. I would use the trays alone were I him, with a non irritating toothpaste like Biotene PBF. Trays are better than Prevident, but I've had some crowns made over the last 6 months and they don't fit any longer, so this is a temp situation till I get the last crown done next month, then I will get new trays made.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.