Injection numbness

I wasn't sure where else to ask this, I know when you get an injection by the dentist the area goes numb, but if you had a normal syringe with needle and you were injected with say blood or water, would the area still go numb or would it just be pain from the needle? can it only go numb with anasthetic?

[turkee23]

only with a anesthetic....like lidocane that the dentist uses....sticking yourself with a needle filled with blood or water will hurt and its not good for you....you could cause some serious damage so dont do that