Hello sir ,
Eating Gutka can cause serious health Hazards .one of the most common is oral cancer .. kindly advise u to either stop it completely or reduce its intake if not possible to stop immediately.
Regarding your query mouth openingis limited due to several reasons .
Common are TMJ JOINT pain which restricts mouth opening .
Or it may be due to any infection or swelling inside mouth
Or it may be also due to lock jaw
Or it may be due to any precancerous lesion or any cancer of jaw or oral cancer of tooth
Next Steps
kindly visit a dentist
Health Tips
limit ur mouth opening as much as possible
eat apple or any other fruit or vegetable by cutting into smaller pieces
be careful while yawning
visit your dentist who will suggest u physio therapy exercises to relieve the pain or discomfort
kindly avoid eating Gutka as much as possible