Is it normal for my cheek to be very swollen due to muscle spasms? i have no infection, my dentist said it was due to a high bite caused by a filling

Hmmm: Swollen cheek from (muscle spasms) due to a high bite from a filling? It sounds a little strange to me. However, without actually being able to personally examine you, i nor anyone else can confirm or refute that observation with any degree of accuracy. Rely on the advice of your own dentist or get a second opinion.

No: It is not normal to be swollen. In this case I am guessing you had a filling placed recently. Also you don't mention pain. So i don't think of an infection and I am assuming the dentist fixed the high bite. It is not uncommon to chew or bite your cheek post operatively while you are still numb. This usually resolves on its own.

No: The high bite will usually result in pain before you would get muscle hypertrophy resulting in a more prominent 'cheek' appearance. It is possible that you have transient swelling from the anesthesia needle placement possibly causing a temporary hematoma (swelling/bruise).This is more common in anesthesia for upper back tooth restorations. Get the bite corrected. Meantime use hot moist compresses.