Table 1.

Key questions in Fonseca's questionnaire and classification of TMD severity.

	Fonseca's key question	Yes	Sometimes	No
1.	Do you feel that it is difficult to open your mouth?
2.	Do you feel that right and left movement of your jaw is difficult?
3.	Do you feel muscular pain and feel tired while chewing?
4.	Do you have headaches frequently?
5.	Do you feel stiffness in your neck?
6.	Do you feel pain in your ears or TMJ?
7.	Do you hear any sounds of the TMJ clicking while chewing or opening your mouth?
8.	Do you grind or clench your teeth?
9.	Do you feel that your teeth do not articulate properly?
10.	Do you feel that you are a tense or nervous person?

Classification of TMD severity based on the key questions in Fonseca's questionnaire
Score	Category
Total between 0 and 15 points	No TMD
Total between 20 and 40 points	Mild TMD
Total between 45 and 65 points	Moderate TMD
Total between 70 and 100 points	Severe TMD