Pain is a universal phenomenon of complex human psychophysiological experience which has evolved from a onedimensional sensation to a multi-dimensional one. 1 The most challenging and rewarding aspects of dental practice is the identification and management of the patient's pain. 2 Unfortunately, most diagnostic procedures are often restricted to identifying a suspected tooth rather than considering possible non-odontogenic sources of pain. 3 Persistent and chronic pain are more prevalent in the cervico-facial region than others. Oro-facial pain encompasses an amalgamation of manifestations within and outside the oral cavity. 4 Pain of neural origin is produced by changes in neurological function or structure, unlike the pain receptors excitation that occurs in nociceptive pain. 5 They occur along a nerve distribution that occasionally confers tooth pain, which frequently becomes a diagnostic difficulty for the general dental practitioner.Trigeminal neuralgia (TN) is a neuropathy of the trigeminal nerve having episodes of unilateral extreme, stabbing, electric shock-like twinge in the facial region innervated by

The aim of this in vitro study was to analyze the effect of green tea on the hardness of eroded dentin. MATERIALS AND METHODS 40 extracted sound human premolars with premeasured hardness values were immersed in Coke for five minutes and then immersed in a green tea solution for five minutes. The surface hardness was remeasured with a Vickers diamond under a load of 500g/10s immediately after each immersion. All hardness values were compared with pretreatment values by the Wilcoxon test. RESULTS The mean ± SD of hardness values before and after insertion in coke was 48.12 ± 1.69 and 45.47 ± 1.55 respectively. The hardness values after immersion in green tea were and 54.32 ± 2.17 with statistically significant differences between the two measurements. Thus, green tea aided in the repair of the eroded dentine by increasing its hardness. CONCLUSION Aerated acidic beverages cause dentinal erosion and decreased surface hardness. Green tea is a healthy beverage with many medicinal effects that increase the hardness of dentin, thus forestalling erosion. Therefore, the consumption of green tea is the most easy, simple and non-expensive method to intercept and treat dentinal erosion and should be promoted.