Background:Teeth have an important role in a person, the most common cause of tooth loss is caries and periodontal disease. Tooth loss can be overcome by making dentures, removable denture components consist of dental elements, clasps, and bases. The denture base is part of denture that rests on soft tissues of oral cavity and is where denture elements are attached. One of the important mechanical properties for denture bases is flexural strength. Acrylic resin denture base material has disadvantage that it absorbs liquid and is porous so that food debris can settle and become a place for microorganisms to grow and multiply. This study aims to determine flexural strength of heat cured acrylic resin for denture base in immersing mouthwash containing siwak Method: this laboratory experiment used 12 linear specimens with a size (64 x 10 x 3.3 mm) ± 0.2 mm in accordance with ISO 20795-1:2013 which were divided into 2 groups, the first group was immersed in aquabidest (control), the second group was immersed in mouthwash containing siwak for 7 days. The data obtained were then tested using the Independent T-test Result: There was no significant difference (p > 0.05) in the flexural strength of heat cured acrylic resin Conclusion: From the research, there is no effect flexural strength of heat cured acrylic resin in soaking mouthwash containing siwak. The effect of mouthwash containing siwak on the flexural strength of heat-cured acrylic resin was not significant.

Resin polymerization which is affected by unstable temperature causes the resin to break easily. The strength of the base material is affected by the forces acting in the mouth, such as transverse forces, other resistance or fatigue, and flexibility. Fracture of denture caused by masticatory loads and is affected by forces acting in the mouth, including transverse, resistance or fatigue, and flexural forces. Experimental Laboratory total of 72 samples consisting of 18 samples of  type A, B and C cured at normal temperature, 100oC, 200oC, and 300oC. Types A, B and C have the effect of heating with the addition of temperature on the impact strength of acrylic resin, because the value of sig = 0.001 < 0.05, so H0 is rejected. An effect with the addition of temperature on the impact strength of the resin types A, B and C, because sig = 0.001 < 0.05, so H0 is rejected, which means that the average results are significantly different due to differences in temperature.

The use of dentures as a substitute for missing teeth is very important, but not everyone with missing teeth wears dentures. Dental and oral health education is an effort to convey messages about dental and oral health. Dental and oral health education requires facilities in the form of educational media, because it can facilitate the delivery of information. Students and teachers at the Assa'adah Orphan Islamic Boarding School in the Kebayoran Baru area, South Jakarta are the right target considering that orphaned and dhuafa adolescents are teenagers from a disadvantaged economic class and are in their infancy who need maintenance of dental health and prevention of tooth decay and repair if you have lost your teeth by making dentures so that they can improve masticatory and aesthetic functions. The purpose of this community service is to improve masticatory and aesthetic functions for SMPI Students and Teachers of the Orphan Islamic Boarding School Assa'adah Jakarta The method of implementing this community service is carried out by conducting counseling with animated video media and leaflet media about the importance of oral health in the use and manufacture of dentures. This activity was attended by 110 students consisting of 55 counseling students on video media methods and 55 students on leaflet media counseling. The results achieved were an increase in knowledge before and after counseling with animated video media with a pre-test score of 387 post test 518 an average score of 9.42 for Leaflet media has a pre-test score of 358, posttest has an average score of 8.1. The conclusion is that there are differences in the knowledge of the post-test group and the animated video media group and the leaflet media with the results of the Independent Sample T-Test different test, it is obtained that the value of Sig.(2-tailed) ) of 0.000 <0.05.

The use of dentures as a substitute for missing teeth is very important, but not everyone with missing teeth wears dentures. Dental and oral health education is an effort to convey messages about dental and oral health. Dental and oral health education requires facilities in the form of educational media, because it can facilitate the delivery of information. Students and teachers at the Assa'adah Orphan Islamic Boarding School in the Kebayoran Baru area, South Jakarta are the right target considering that orphaned and dhuafa adolescents are teenagers from a disadvantaged economic class and are in their infancy who need maintenance of dental health and prevention of tooth decay and repair if you have lost your teeth by making dentures so that they can improve masticatory and aesthetic functions. The purpose of this community service is to improve masticatory and aesthetic functions for SMPI Students and Teachers of the Orphan Islamic Boarding School Assa'adah Jakarta The method of implementing this community service is carried out by conducting counseling with animated video media and leaflet media about the importance of oral health in the use and manufacture of dentures. This activity was attended by 110 students consisting of 55 counseling students on video media methods and 55 students on leaflet media counseling. The results achieved were an increase in knowledge before and after counseling with animated video media with a pre-test score of 387 post test 518 an average score of 9.42 for Leaflet media has a pre-test score of 358, posttest has an average score of 8.1. The conclusion is that there are differences in the knowledge of the post-test group and the animated video media group and the leaflet media with the results of the Independent Sample T-Test different test, it is obtained that the value of Sig.(2-tailed) ) of 0.000 <0.05.