There are 3 general types:

Thermal: Agents are applied to increase or decrease the temperature of a tooth and stimulate a pulp sensory response.Cold tests: Most commonly, ethyl chloride is sprayed onto a small ball of cotton wool and is applied to the tooth, which produces intense cold. Alternatively, CO2 snow and other refrigerants such as dichlorodifluoromethane (DDM) have been shown to be effective. Heat tests: Gutta percha can be heated and directly applied to the tooth to produce heat. Electrical pulp test: Electric pulp testing (EPT) has been available for over a century and is used by dentists worldwide. It is used to determine the health of the pulp and pulp-related pain.EPT is based on the stimulation of sensory nerves in the pulp. It does not provide information on vascular supply to the pulp. The probe tip of the test device is placed directly onto the tooth surface and an electrical stimulus is produced. This stimulus causes an ionic change across the neural membrane, inducing an action potential in the myelinated nerves. The threshold of pain is determined by increasing the voltage. A tingling sensation is felt once the voltage reaches the pain threshold. This threshold level varies between patients, and is affected by factors such as age, pain perception, tooth surface conduction and resistance. The requirements of an EPT are appropriate application method, careful interpretation of the results, and an appropriate stimulus. EPT must be done with tooth isolation and conduction media.
Sertraline, sold under the brand name Zoloft among others, is an antidepressant of the selective serotonin reuptake inhibitor (SSRI) class. The efficacy of sertraline for depression is similar to that of other antidepressants, and the differences are mostly confined to side effects. Sertraline is better tolerated than the older tricyclic antidepressants, and it may work better than fluoxetine for some subtypes of depression. Sertraline is effective for panic disorder, social anxiety disorder, generalized anxiety disorder, and obsessive–compulsive disorder (OCD). However, for OCD, cognitive behavioral therapy, particularly in combination with sertraline, is a better treatment. Although approved for  post-traumatic stress disorder, sertraline leads to only modest improvement in this condition. Sertraline also alleviates the symptoms of premenstrual dysphoric disorder and can be used in sub-therapeutic doses or intermittently for its treatment.Sertraline shares the common side effects and contraindications of other SSRIs, with high rates of nausea, diarrhea, insomnia, and sexual side effects, but it appears not to lead to much weight gain, and its effects on cognitive performance are mild. Similar to other antidepressants, the use of sertraline for depression may be associated with a higher rate of suicidal thoughts and behavior in people under the age of 25. It should not be used together with MAO inhibitor medication: this combination causes serotonin syndrome. Sertraline taken during pregnancy is associated with a significant increase in congenital heart defects in newborns.Sertraline was invented and developed by scientists at Pfizer and approved for medical use in the United States in 1991.