What can I do to stop what doctors call the tick. This is when I am constantly chewing on my gums. How can I stop this problem?

Look for a cause 1st. There can be medical, medication, dental or emotional reasons for chewing your gums. What medications are you taking? Antipsychotic & mood stabilizing meds as well as some antidepressants can be reasons. Gum disease, dental plates or unerupted wisdom teeth also factor in. Anxiety may be the issue &, yes, it can be simply a tic disorder. Each require specific help from professionals. Seek them out.
Chewing tic. I would want to first know if you are already on a medication which may be contributing to your problem. If not, then i guess chewing gum would be an option. I suppose you have already tried that. Good luck.