Can music at a frequency of 432 Hz reduce dental anxiety in patients undergoing tooth extraction?

INTERVENTION: The study will consist of three arms, the participants of the three groups will be randomized by a simple randomization using an online randomizer. All the participants will be intervened once, when they come to the clinics for a tooth extraction. Each participant before the tooth extraction will answer the CORAH MDAS anxiety scale, and those who obtain a score of 9 or above will apply. A saliva sample will be collected from each participant before the intervention. The first group will receive music (Giorgio Constantini “Dreamersâ€?) at a frequency of 432 Hz during 15 minutes with headphones at a moderate volume, then a second saliva sample will be taken and he will answer the anxiety questionary again. The second group will receive music (Giorgio Constantini “Dreamersâ€?) at a frequency of 440 Hz during 15 minutes with headphones at a moderate volume, then a second saliva sample will be taken and he will answer the anxiety questionary again. The third group will not be exposed to music, patients will be set in the dental unit during 15 minutes after the first saliva sample, then a second saliva sample will be taken and he will answer the anxiety questionary again. Then the profesional will proceed with the tooth extraction as normal. CONDITION: Dental anxiety ; Mental and Behavioural Disorders ; Specific (isolated) phobias PRIMARY OUTCOME: ; 1. Dental anxiety will be measured using the CORAH‐ MDAS questionnaire before and after music stimulation.; 2. Salivary Cortisol will be measured using 3 ml of unstimulated saliva before and after music stimulation.; 2.1. Saliva samples will be transported under refrigeration conditions and then frozen at ‐20 ºC until laboratory analysis.; 2.2. For statistical analysis, the amount of saliva secreted will be expressed in mL / min and cortisol expressed in ug / dl.; INCLUSION CRITERIA: 1. A Modified Dental Anxiety Scale in Spanish (MDAS) score greater > 9 points 2. 15 to 30 years of age 3. ASA I 4. Requiring simple tooth extraction.