Went to dds today cavity in #19 filled. i am hard to numb and had numerous shots, now have pain and lots of bruising on inside cheek. is that normal?

Cavity filling: Usually, it is common if there's numerous shots involved for the dental numbing. If pain didnot resolved in few days even with pain killer taken, please contact your dentist for evaluating the possible root canal treatment. Root canal treatment might be needed for the problem tooth if tooth has constant pain after filling.

Yes: Sorry that you're having discomfort. Sometimes lower teeth can be challenging to anesthetize. I recently had some dental work myself and had only one injection, but i was surprised that i was sore for about a week after. The injection wasn't at all painful. I've had this happen my patients and i always feel bad about it.

To a degree: Many people who claim to be 'hard to numb' actually have an anatomy slightly different from the norm. The injection site for #19 pierces a triangular sheath in hopes of bathing the nerve to put the jaw to sleep. Often times, when a muscle is pierced it will illicit the symptoms you've described. No two people have the same anatomy and no two people experience identical procedures, but we try.