Is it normal to have crunching and grinding in my tm joints during movement?

See your dentist: Are you referring to movement of your jaw? If so theses sounds indicate a dysfunction in the tm joint and over time can lead to TMJ disorder. Talk to your dentist for further help/diagnosis/treatment.

It depends: Could be that you have TMJ syndrome, would recommend TMJ exercises. If you get other joint pains then would see a rheumatologist to evaluate for other systemic causes for joint pains. The TMJ has joint tissues and can be a sign of rheumatoid arthritis in some cases. Most people with TMJ don't have systemic causes and can be treated with simple TMJ exercises. Look these up on line.

NO: A healthy joint is noiseless when it moves. If you have joint noise it usually means that something inside your joint is not working correctly. These problems usually do not self correct. Check with your dentist and see if your dentist can help you, or refer you to someone that treats these type of problems. Always diagnose these with reversible means before you consider any treatments.