hello
clinching of teeth may be due to various factors which include
gingivitis,
bruxism,psychological troubles etc etc
now to find out the exact cause you would need to pay a visit to your
dentist if its gingivitis you would need to go through scaling procedure
if its bruxism than you may have to wear night guards or may have to go through orthodontic treatment
bruxism may be even related to stress /
anxiety ,so if thats the case you may even need to get a consultation from a
psychologist in the mean while,i would also like to tell that most common cause is gingivitis and you can do the following to subside the symptoms
1.luke warm saline rinses 4-6 times daily
2.gum astringents like oracep ,take a drop of astingent on your clean index finger tip and gently massage the gums after every rinse
if the condition appears to subside by this than the only thing you would need is a proper scaling and and than maintaining proper oral hygiene
hope that helps