How to write an introduction for a research paper WITH EXAMPLES

Introduction, like any other section of an academic paper, is important and needs to be written appropriately. It is possible for it to lack vital information or be devoid of important ones.

Attached to this post is a video explaining in detail, all that is required to write a detailed and excellent introduction. Make sure to watch to the end.

Interestingly, I’ve copied the introduction of one of my papers as an example below. Make sure to read and note the details explained in the video. 




World Health Organisation (1962) has defined dental caries as ‘a localised, post-eruptive, pathological process of external origin involving softening of the hard tooth tissue and proceed to the formation of a cavity’. Caries leads to an imbalance in the de-mineralization and re-mineralization of dental hard tissue. The aetiology of dental caries results from a complex interplay of several factors which include: cariogenic bacteria, saliva, sugar and time (Alayyan, 2017; Fisher-owens, 2007). The involvement of these factors makes it a multi-factorial disease.As a public health issue, several people in the world from high, middle and low-income countries are affected by dental caries with a prevalence rate of approximately 30% – 50% in children from  high-income countries (Vernazza, 2016; Dye, 2015) and 90% in low-income countries (Ayele, 2013; Peltzer, 2015). It is ranked as one of the most common ‘preventable chronic disease in children’ being seven times commoner than hay fever and five times commoner than asthma (Alazmah,2017).

Currently, the persistence of social inequality in dental health has been associated with the variation in the prevalence of the disease around the world (Walsh, 2010; Vernazza, 2016). While some countries have experienced a reduction in the burden of the disease, many countries and communities are still significantly burdened by the disease. The United Kingdom has experienced a significant reduction in the prevalence and severity of dental caries. According to a national survey in England, 27.3% decrease in dental caries was recorded among five year olds between 2008 and 2015 (Public Health England (2016). Wales and Scotland also recorded a similar trend of decrease prevalence which was attributed to increase fluoride prescription and use (Jones, 2017     ). The situation in America and several Asian countries is quite the opposite. From 1988 till 2004, America recorded an increase in prevalence among children from 24% to 28%. However, this prevalence has further increased to 36.7% as reported by the National Centre for Health Statistics (Dye, 2015      ). In the low-income countries in Africa, there is a rapid surge in caries burden because of the increased rate of sugar consumption and minimal exposure to fluoride use ., according to the World Health Organization (WHO, 2016).                                   .Although caries reduction among adults has been quite successful, the challenge remains in prevention among children.

At population level, untreated caries in children leads to severe pain, growth distortion, tooth loss, behavioural changes, dysfunction as regards speech, sleep and feeding  (Schroth, 2014   ). Furthermore, the disease also has both emotional and social impact on the children in terms of linkage between low self-esteem and tooth loss with an overall decrease in quality of life (Shah, 2015; Moure-Leite, 2011; Blumenshine, 2008). Untreated dental caries in permanent teeth was the most prevalent chronic condition reviewed in the Global Burden of Diseases in 2010 affecting 35% of the global population. The prevalence in primary teeth is affecting an approximate of 621 million children globally (Kassebaum, 2015). The existence of caries in primary teeth is a major predisposing factor to having cares involving the permanent teeth. Children with primary teeth caries have a three times likelihood of developing caries involving their permanent teeth particularly if all causative factors remains thesame (Peretz, 2003). There are also financial implications of dental caries with a large percentage of healthcare budget allocated to treating it. A focus on prevention of the disease is considered more cost-effective than treatment and l will improve oral health alongside the overall wellbeing of the children (Alazmah, 2017).

Fluoridation is a caries preventive and treatment strategy that has been in existence for over eighty years and still remains the cornerstone of caries intervention till date (Ferjerskov, 2008; Marinho, 2003a). Fluoridation can be done via the topical or systemic route.Topically, the fluoride (in high concentration) is applied directly to the tooth surface without ingesting it while on the contrast, the systemic route involves the ingestion of fluoride.

Toothpastes are either fluoridated or non-fluoridated. Fluoride toothpaste (also known as dental dentifrice) is the most used and readily available form of topical fluoridation in the prevention of dental caries (Marinho, 2003b). Available in various concentration and composition, several dental bodies have contributed to increase usage of toothpaste. The various fluoride compound include sodium fluoride, sodium monofluorophosphate, amine fluoride and stannous fluoride (Walsh, 2010; Marinho, 2003b). Fluoride is not the only constituent of fluoridated toothpaste, it also contains abrasives, surfactant, pigments and flavours.

Public health professionals and researchers have made an evidence-based conclusion that fluoridated toothpaste is the ‘method of choice’ in the prevention of childhood caries. This conclusion was based on its convenience , availability, effectiveness and cultural approval (Messina, 2016; WHO, 2016; Marinho, 2004).However, the usage of fluoridated toothpaste in middle and low-income countries is limited because of its cost.

Water fluoridation (also known as community water fluoridation); the most popular form of systemic fluoridation is the a specified quantity of fluoride compound to public water supply for consumption. The optimum amount of fluoride required in water is 1ppm (WHO,2011) while the maximum level safe for consumption is 1.5ppm according to the European Union water quality directive (European Union,1998).

Community water fluoridation began in USA in1945 and still practised in approximately 25 countries in the world. It is believed to play a massive role of about 40% – 70% in the prevention of dental caries among children ( check ppt presentation. ). This form of intervention impacts the population and requires no individual approval or consent. However, it is not without criticism concerning the ethics of ‘mass intervention’ (Nuffield, 2007).

Arguably, the local effect fluoride has on tooth surface has been considered the most important effect against caries. The regular usage of fluoridated toothpaste causes an elevated amount of fluoride in the saliva which in turn results in the deposition of calcium fluoride on the tooth surface. Calcium fluoride functions acts by resisting the acid attack by cariogenic bacteria (Messina, 2016; Staun-Larsen, 2017). The effectiveness of fluoride action on tooth surface is measured using the standardized World Health Organisation index called the ‘decayed, missing, filled teeth index’ (DMFT or dmft in permanent and primary teeth respectively). The index measures the change in caries activity (Khamis, 2016).

Fluoride provides a balance between demineralisation and remineralisation process, this is essential in caries prevention. Ingestion of fluoride in water fluoridation exposes the oral cavity to fluoride ions and its protective effects (Cheng,2007).

In conclusion, the prevention of dental caries is considered a priority than treatment because of its cost-effectiveness (Cummins, 2013).Fluoridation remains the cornerstone of dental caries prevention. There is a current variation in the prevalence of dental caries, therefore, countries with high prevalence are in need of preventive measures that is effective in achieving a decline with a limited budget.Water fluoridation and fluoride toothpastes are the two most used and popular methods of fluoridation. The purpose of this review is to determine the most effective of the two interventions in the prevention of dental caries.



Alayyan, W., Al Halabi, M., Hussein, I., Khamis, A. and Kowash, M. (2017) A Systematic Review and Meta-analysis of School Children’s Caries Studies in Gulf Cooperation Council States. Journal of International Society of Preventive & Community Dentistry7(5), pp. 234–241.                                                        

Alazmah, A. (2017) Early Childhood Caries: A review. The Journal of Contemporary Dental Practice, 18(8), pp. 1-6.

Ayele, F.A., Taye, B.W., Ayele, T.A. and Gelaye, K.A. (2013) Predictors of dental caries among children 7-14 years old in Northwest Ethiopia: a community based cross-sectional study. BMC Oral Health, 13(7).

Blumenshine, S.L.Vann, W.F.J.Gizlice, Z. and Lee, J.Y. (2008) Children’s school performance: impact of general and oral healthJournal of Public Health Dentistry, 68(2), pp. 82-87.

Chandler JChurchill RHiggins JLasserson T. and Tovey D. (2016) Cochrane Methods. Cochrane Database of Systematic Reviews. [pdf] Issue 10. Available at: [Accessed 15 December 2017].

Cummins, D.(2013) The development and validation of a new technology, based upon 1.5% arginine, an insoluble calcium compound and fluoride, for everyday use in the prevention and treatment of dental caries. Journal of dentistry, 41(2), pp. 1-11.

Disney, J.A.Bohannan, H.M.Klein, S.P. and Bell, R.M. (1990) A case study in contesting the conventional wisdom: school-based fluoride mouthrinse programs in the USACommunity Dentistry and Oral Epidemiology,18, pp. 4654.

Dye, B.Thornton-Evans G.Li, X. and Iafolla, T. (2015) Dental Caries and Sealant Prevalence in Children and Adolescents in the United States, 2011–2012. [pdf] United States: Centers for Disease Control and Prevention. Available at: [Accessed 21 December 2017].

FDI Commission (2002) Mouthrinses and dental cariesInternational Dental Journal, 52(5), pp.337-345.

Fejerskov, O. and Kidd, E.A.M. (2008) Dental Caries: the Disease and its Clinical Management. 2nd edn. Oxford: Blackwell Munksgaard.                                        

Fisher-Owens, S.A.Gansky, S.A.Platt, L. J.Weintraub, J.A.Soobader, M.J., Bramlett, M.D. and Newacheck, P.W. (2007) Influences on children’s oral health: a conceptual modelPediatrics, 120(3), pp. 510-520.

Horowitz, H.S. and Heifetz, S.B. (1970) The current status of topical fluorides in preventive dentistry. Council on Dental TherapeuticsJournal of the American Dental Association,81(1), pp. 16677.

Jones, C.M., Davies, G.M., Monagham, N.,  Morgan, M.Z., Neville, J.S. and Pitts, N.B. (2017) The caries experience of 5 year old children in Scotland in 2013-2014 and in England and Wales in 2014-2015. Reports of cross-sectional dental survey using BASCD. Community Dental Health, 34, pp. 157-162.

Kassebaum, N.J.Bernabé, E.Dahiya, M.Bhandari, B.Murray, C.J. and Marcenes, W. (2015) Global burden of untreated caries: a systematic review and metaregressionJournal of Dental Research, 95(5), pp. 650-658.

Khamis, A.H. (2016) Re-visiting the Decayed, Missing, Filled Teeth (DMFT) index with a mathematical model concept. Open Journal of Epidemiology, 6, pp. 16-22.

Marinho, V. C. C.Higgins, J. P. T.Logan, S. and Sheiham, A. (2003a) Topical fluoride (toothpastes, mouthrinses, gels or varnishes) for preventing dental caries in children and adolescentsCochrane Database of Systematic Reviews, Issue 4. Available at:

Marinho, V. C. C.Higgins, J. P. TSheiham, A. and Logan S. (2003b) Fluoride toothpastes for preventing dental caries in children and adolescents. Cochrane Database of Systematic Reviews, Issue 1. Available at:

Marinho, V. C. C.Higgins, J. P. T.Sheiham, A. and Logan, S. (2004) One topical fluoride (toothpastes, or mouthrinses, or gels, or varnishes) versus another for preventing dental caries in children and adolescentsCochrane Database of Systematic Reviews, Issue 1. Available at:

Marinho, V. C. C.Worthington, H. V.Walsh, T. and Clarkson, J. E.(2013) Fluoride varnishes for preventing dental caries in children and adolescentsCochrane Database of Systematic Reviews, Issue 7. Available at:

Marinho, V. C. C.Worthington, H. V.Walsh, T. and Chong, L. Y. (2015) Fluoride gels for preventing dental caries in children and adolescentsCochrane Database of Systematic Reviews, Issue 6. Available at:

Marinho, V. C. C.Chong, L. Y.Worthington, H. V. and Walsh, T. (2016) Fluoride mouthrinses for preventing dental caries in children and adolescentsCochrane Database of Systematic Reviews, Issue 7. Available at:

Messina, M.J. (2016) Fluoride, Dental Caries, and Safety. Generations, 40(3), pp. 41.

Moure-Leite, F.R.Ramos-Jorge, J.Ramos-Jorge, M.L.Paiva, S.M.Vale, M.P. and Pordeus, I.A. (2011) Impact of dental pain on daily living of five-year-old Brazilian preschool children: prevalence and associated factorsEuropean Archives of Paediatric Dentistry,12(6), pp. 293-297.

Nuffield Council (2007) Public health: ethical issues. [pdf] Available at: [Accessed 12 April 2018]

Peltzer, K. and Mongkolchati, A. (2015) Severe early childhood caries and social determinants in three-year-old children from Northern Thailand: a birth cohort studyBMC Oral Health,15, pp. 108-112.

Peretz, B.Ram, D.Azo, E. and Efrat, Y. (2003) Preschool caries as an indicator of future caries: a longitudinal studyPediatric Dentistry,25(2), pp.114-118.

Petersen, P.E. (2009) Global policy for improvement of oral health in the 21st century – implications to oral health research of World Health Assembly 2007; World Health OrganizationCommunity Dentistry and Oral Epidemiology,37(1),pp. 18.

Prabhu, A., Prasanna, B., Sakeenabhi, B., Prashanth, G., Subramaniam, R. and Ragher, M. (2017) Effect of fluoride varnish and dentifrices and its combination on deciduous enamel demineralization: An In vitro study. Journal of Pharmacy and Bioallied Sciences, 9(5), pp. 112-116.

Public Health England (2016) National dental epidermiological programme for England: oral health survey of 5 year old children in 2015: a report on prevalence and severity of dental decay. [pdf] London: Public Health England. Available at: [accessed 12 December 2017].

Public Health England (2017) Delivering better oral health: an evidence-based toolkit for prevention. [pdf] 3rd edn. London: Public Health England. Available at: [accessed 12 December 2017].

Schroth, R.J.Lavelle, C.Tate, R.Bruce, S.Billings, R.J. and Moffatt, M.E. (2014) Prenatal vitamin D and dental caries in infants.Pediatrics,133(5), pp. 12771284.

Shah, R. J., Diwan, F. J., Diwan, M. J., Chauhan, V. J., Agrawal, H. S., and Patel, G. C. (2015). A study of the emotional effects of tooth loss in an edentulous Gujarati population and its association with depression. The Journal of the Indian Prosthodontic Society15(3), 237–243.

Somaraj, V., Shenoy, R.P., Panchmal, G.S., Kumar, V., Jodalli, P.S. and Sonde, L. (2017) Effect of Herbal and Fluoride Mouth Rinses on Streptococcus mutans and Dental Caries among 12-15-Year-Old School Children: A Randomized Controlled Trial [pdf]. International Journal of Dentistry,2017(1). Available at: https: //

Stamm, J.W. (1993) The value of dentifrices and mouthrinses in caries preventionInternational Dental Journal,43, pp. 517-527.

Staun- Larsen, L., Baelum, V., Tenuta, L.M.A., Richards, A. and Nyvad, B. (2017) Fluoride in Dental Biofilm Varies across Intra-Oral Regions. Caries Research, 51, pp. 402-409.

Vernazza CR, Rolland SL, Chadwick B and Pitts N. (2016) Caries experience, the caries burden and associated factors in children in England, Wales and Northern Ireland. British Dental Journal, 221, pp. 315-320.

Walsh, T.Worthington, H.V.Glenny, A.M.Appelbe, P.Marinho, V.C.C. and Shi, X. (2010) Fluoride toothpastes of different concentrations for preventing dental caries in children and adolescents.Cochrane Database of Systematic Reviews, Issue 1. Available at:

World Health Organisation (1962) Standardization of reporting dental diseases and conditions. [pdf] Geneva: WHO. Available at: [Accessed 12 December 2017].

World Health Organisation (2016) Promoting Oral Health In Africa. [PDF] Congo: WHO. Available at: [Accessed 14 December 2017].

World Health Organisation (2017) Oral health: What is the burden of oral health. Available at: [accessed 14 December 2017].