I am having a root canal. Will Valium and halcion (triazolam) help meat the dentist's?

Maybe. Halcion (triazolam) and valium are sedative drugs in the benzodiazepine family. They are given to anxious and/or phobic patients prior to treatment to better help them tolerate an appointment. They have two main effects: sedation and amnesia. In other words, they relax and stop memory while active. Effective dosages vary among patients, so whether or not it works for you is unknown, but i recommend it.
They will help you. They will help you to relax.
It can help. Valium and Halcion (triazolam) are two drugs that have been frequently prescribed and used in some dental offices to help anxious patients. Before taking any sedative or pain medication before a dental procedure, you must check with your dentist.
Be careful. That combination is a common protocol for oral, conscious sedation. It is essential that these drugs be administered by the dentist with careful monitoring of vital, signs. Do not undertake this by self administration.