I have tooth pain and was prescribed tylenol #3 for the pain. i am also prescribed 10mg valium. is it safe for me to take a valium now and then a tylenol #3 about 4 hours later before bed?

Yes, but: Generally safe but there is risk of excess sedation when you take pain medicine and anxiety medicine together

Not good idea: Anti-anxiety med combined with anti-pain med can combine to slow your reflexes. If taking both may make driving or handling machinery less safe, and may affect your insurance coverage (your policy may say to not drive if impaired). Additionally anti-pain meds will only mask symptoms, not affect a cure, as infection spreads throughout your body. Please see Dentist for competent treatment.