Orthodontist's instruction (4)
I believe the answer is:
bite
(Other definitions for bite that I've seen before include "Take bait; sting" , "champ" , "Puncture by 9 [ADDER]" , "Grip; take effect" , "Take effect; snack" .)
I believe the answer is:
bite
(Other definitions for bite that I've seen before include "Take bait; sting" , "champ" , "Puncture by 9 [ADDER]" , "Grip; take effect" , "Take effect; snack" .)