 [ Symptoms ] my knee will occasionally catch at which time a minor adjustment with my hand kind of unlocks the knee [ Disease ] dental varnish contains fluoride is anticarious and hence prevents progression of tooth decay pit caries are very minute and very minimal cavities that are superficially present on the teeth pit caries do not require fillings because to do the filling a little bit of normal tooth structure has to be drilled so varnish is preferable in very small cavities like yours rarely small pit caries seen clinically might have progressed deeply in a triangular pattern with apex seen outside but broad base deep inside the tooth yours might be of this type and hence causing pain follow up with a dentist online after taking an iopa intraoral periapical x ray to confirm the deep caries   > <link>