1.   He clenched his teeth together but the first syllable forced itself around the corner of his mouth.

2.   Her breath was hissing in and out audibly as if her teeth were clenched.

3.   I clenched my teeth and closed my eyes as the plane headed straight into very uncertain, very uncharted territory indeed.

4.   I clenched my teeth, wondering what to do now.

5.   My Apron flapped, my teeth were clenched.

6.   See if your teeth are clenched or if your spine is rigid.

7.   The old man seems to be clenching his teeth.

8.   He clenched his teeth and continued to look straight ahead.

9.   Clenching his teeth, George had to remind himself that he had now got just the endorsement he wanted.