I would try any and every thing to save the teeth.

Give it a try. The bitter apple works in the house. Spray it in his mouth and hold his mouth shut. It will be god awful for him. Do that a couple times a day. The spray the chain down. If he smells it he will leave it along. He will not forget and it will rub off/wash off in the rain. But a few squirts here and there will refresh his memory.

Best of luck.

EWO