Oral health and elite sport performance.

While the research base is limited, studies have consistently reported poor oral health in elite athletes since the first report from the 1968 Olympic Games. The finding is consistent both across selected samples attending dental clinics at major competitions and more representative sampling of teams and has led to calls from the International Olympic Committee for more accurate data on oral health. Poor oral health is an important issue directly as it can cause pain, negative effects on appearance and psychosocial effects on confidence and quality of life and may have long-term consequences for treatment burden. Self-reported evidence also suggests an impact on training and performance of athletes. There are many potential challenges to the oral health of athletes including nutritional, oral dehydration, exercise-induced immune suppression, lack of awareness, negative health behaviours and lack of prioritisation. However, in theory, oral diseases are preventable by simple interventions with good evidence of efficacy. The consensus statement aims to raise awareness of the issues of oral health in elite sport and recommends strategies for prevention and health promotion in addition to future research strategies. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

Introduction

Oral health is an integral part of general health and well-being and a basic human right1

A consistent finding in published studies is that oral health of elite athletes is poor (both selected samples attending dental clinics or more representative evaluations of teams). This is a striking statement considering the preventable nature of oral diseases and their potential for impact on health, well-being and performance of otherwise healthy, fit and highly prepared athletes. Dental consultations at the London 2012 Summer Olympic Games comprised 30% of all medical visits (second only to musculoskeletal),2 highlighting the burden of oral healthcare on facilities during major competitions. This demand has increased over successive games.3

Call to action

Our purpose with this consensus statement is a call to action regarding oral health in sport since there is no evidence of an improving situation. As background, this paper will first summarise the key issues; what we know about oral health in elite sport, the impact of oral health on performance, how oral health might affect performance, why athletes have poor oral health and evidence-based oral health promotion and disease prevention. It will then conclude with recommendations to guide the improvement of oral health in elite athletes. Methods: this consensus statement is informed by a systematic review and subsequent discussion by participants of the symposium, Oral Health and Performance in Sport—Learning from London 2012, 4 April 2013, UCL, London. Since several articles have been written about orofacial trauma previously, the focus of this statement is concerned with oral health.

What do we know about oral health in elite sport?

We conducted a detailed systematic review based on the focused question: What is the oral health of athletes and what is the effect of oral health on athletic training and performance?4 We searched MEDLINE, EMBASE, EBSCO SPORTDiscus and OpenGrey up to October 2013 with no language restrictions. Duplicate screening, eligibility assessment, data abstraction and methodological quality were conducted of observational studies. Of 9858 potentially relevant citations, 39 studies were eligible for review. We limited the review to studies on elite or professional sport participants. The included studies represented a wide range of sports, particularly Olympic, with Europe being the most frequent location for research (38% studies). The studies represented true epidemiological research as well as reports of service utilisation in polyclinics. In view of differences in methodology, data were summarised by ranges rather than attempting meta-analysis.

Overall, oral health was consistently poor across these studies, especially considering the young age of the participants. Dental caries, periodontal disease, dental erosion and pericoronitis (infections around wisdom teeth)/impacted third molars were widely reported. The range of proportion of athletes affected by these conditions were dental caries 15–75%, moderate-to-severe periodontitis up to 15%, dental erosion 36–85% and pericoronitis/impacted third molars 5–39%. Dental trauma was reported by 14–57% of athletes in at-risk sports. Disease incidence was generally not clearly differentiated by socioeconomic status, however, poor oral health appears to affect athletes both from developing and developed countries. There are however, important limitations to the data: (1) The methodological strength of evidence was generally low. (2) The data include both studies where the sampling of athletes may not be representative (eg, attendance at dental clinics) as well as those investigating whole teams. However, poor oral health was common to both sets of studies. (3) The number of studies is relatively low. In summary, within the limitations described, the available evidence suggests

Poor oral health is common in elite or professional athletes;

The oral health of elite athletes is similar to non-athlete disadvantaged populations.

What do we know about oral health and impact on elite sport performance?

The systematic review also searched for evidence for an impact of oral health on performance. Four studies reported relevant data which were all athlete self-reported measures. Some studies included athletes attending dental clinics and others assessment of complete teams. The proportion of athletes reporting a negative impact of their oral health included 33–66% following trauma, 28–40% being bothered by their oral health or with an impact on their quality of life and 5–18% with an effect on performance. There were no data on the effect of oral health on time loss or impact on training quality. In summary, although the tools used to measure impact on performance and quality of life appeared to lack sensitivity and the samples are mostly from those attending for dental care, a sizeable proportion of athletes appear to report an impact on their well-being, training or performance.

How might oral health affect performance?

Oral health is one of the determinants of life quality.5 There is a wealth of literature demonstrating impacts of oral diseases on the quality of life including caries,6 periodontal disease7 and pericoronitis.8 With clear psychosocial impacts of oral health, it would be surprising if training and performance were not affected in those athletes with poor oral health. Furthermore, subtle effects on training and performance could conceivably be highly important in an environment in which the ‘aggregation of marginal gains’9 is critical. Impacts on performance from oral diseases could arise from pain10 increased systemic inflammation11 and impaired confidence and socialisation.5 In summary, poor oral health could affect performance directly though pain arising from disease conditions but also more subtly from effects such as increased systemic inflammation and psychosocial impacts that may be less evident to athletes themselves.

Why might athletes have poor oral health?

There are many challenges to oral health in athletes. These include proximal factors close to the athlete and distal or more downstream factors.

Nutrition

Nutritional intake, including usual diet, sports drinks and supplements is a major determinant of oral health, including dental caries, periodontal disease and dental erosion. Training and performance are often supported by carbohydrate-containing sports drinks and gels,12 which are taken frequently during activity.13 These drinks include energy drinks (normally with a CHO concentration of >10%), isotonic sports drinks (4–8% CHO) and hypotonic drinks (normally around 2% CHO or less).

Dietary carbohydrate intake is one of the most well-characterised causative factors for dental caries14 and acidic foodstuffs and beverages are the main factors causing erosion.10 15 A relationship between dental caries and frequency of sports drink intake has been reported in children,16 but few studies have examined this relationship in the elite athlete population. The proinflammatory effects of a high carbohydrate intake might also increase risk of periodontal disease.17 18 Clearly, sports supplements are only part of nutrition in athletes that might affect oral health.

In several sports body weight, composition and aesthetics are crucial factors to the athlete,19–21 increasing the risk of eating disorders. It would seem appropriate that the early detection of eating disorders could prevent further detrimental effects both physically and mentally for patient. It has been shown that the elite athlete is more susceptible to eating disorders than the average member of society. The need to particularly reduce weight for example in boxing, horse riding, gymnastics and long-distance running can lead to eating disorders being prevalent.22 There is a role for the general dental practitioner and the sports dentist in particular to detect signs and symptoms of tooth erosion as a result of eating disorders.23 24 It is therefore critical that elite athletes are screened for not only dental disease but what can be the first/earliest signs of eating disorders that manifest themselves in the oral cavity.

Host regulation

Dehydration and local drying of the mouth during sporting activity might increase the impact of carbohydrates on caries and acidic drinks on erosion by reducing salivary flow or amount and therefore impairing the protective properties of saliva.25 These properties include non-specific and specific antimicrobial activity (also important in protection against periodontal diseases) and re-mineralising effects of saliva.26 Immunoinflammatory protection against the microbial challenge of dental caries and periodontal disease could also be compromised by exercise-induced immune suppression.27

Health behaviours, knowledge and environment

Health behaviours, health beliefs, oral health literacy, access to preventive programmes and prioritisation of time are all recognised as important determinants of oral health.28 Little is known about these factors in elite sport although awareness of risk of oral disease appears low13 and less than half of athletes in one sample attended for regular oral health assessments.10 However, regular attendance for dental examinations does not necessarily predict better oral health.29 30 Traditional models of dental clinic care and their remuneration focus on treatment rather than on preventing disease or promoting health.31–34 Therefore, athletes may still find difficulty in accessing preventive advice even where organised dental care is available. Furthermore, it would be simplistic to consider the athlete in isolation. Rather, the oral health of an individual athlete is very likely to be influenced or even dependent on the surrounding network of peers, support staff and organisations35 36 In summary, athletes are exposed to a number of challenges in maintaining good oral health including proximal factors directly under the control of the individual and more downstream, distal factors related to the local environment and support network.

Promotion of oral health, prevention of oral diseases and mitigation of risk

Oral diseases are preventable.37 Simple interventions may have a dramatic impact on oral health (summarised in table 1) including use of high strength fluoride toothpastes, other topical fluoride preparations, behavioural change related to diet and oral hygiene (effective dental plaque removal) and pattern of use of acidic drinks, for example, sports drinks. Early identification of pericoronitis and extraction of third molars if recurrent is also important. While not a focus of this statement, use of custom-made mouthguards is important for participation in sports at risk of trauma. A further strategy to consider is mitigation of risk. Since some risk factors may be difficult to reduce at times, for example frequency of carbohydrate intake during training, interventions which reduce harm might be helpful. For instance modified sports drinks have been reported.38 39 A brief summary of types of interventions is summarised in table 1.

Table 1

Types of preventive and risk mitigation interventions for dental caries, periodontal disease, dental erosion and pericoronitis

Condition	Intervention
All conditions	Health promotion, education and behaviour change: multilevel approach including individual (athlete), local (medical, dental and performance support team) and high level (national/international sport organisations)
Dental caries	Dietary: when feasible, reduced frequency and amount of carbohydrate intake. Matching sports drink to purpose, for example, for hydration, hypotonic drink or water
	Fluoride: for example, toothpaste containing at least 1400 ppm fluoride and preferably 5000 ppm
	Oral hygiene: effective daily dental plaque removal (toothbrushing and interdental cleaning)
Periodontal disease	Oral hygiene: behaviour change to achieve effective daily dental plaque removal (toothbrushing and interdental cleaning)
	Assessment: early detection and treatment (secondary prevention)
	Risk factor reduction: tobacco use cessation
Dental erosion	Dietary: reduced frequency of acidic food/beverage intake
	Sports drinks: where feasible; reduced frequency, avoiding prolonged retention in mouth, using straw to drink
Pericoronitis	Oral hygiene: careful plaque removal around impacted third molar
	Extraction: extraction of third molar after no more than two episodes of pericoronitis

However, many of these interventions rely on or are affected by health behaviours which are notoriously difficult to change.40 Furthermore, as discussed above, the expression of oral health in an individual athlete should be considered the product of a matrix of factors, including more downstream determinants including their local environment and broader sporting context. Unfortunately, there are no studies in the literature that we are aware of that have reported on the effect of oral disease prevention or health promotion strategies in athletes.

A template has been developed by a recent IOC consensus statement regarding the prevention of non-communicable disease.40 Although not directed specifically at elite athletes, this guidance focuses on simple interventions that include a focus on behavioural change and which are designed with an understanding of individual preferences but with engagement and participation across relevant networks. Embedding oral health within such an approach would seem a realistic strategy to achieve both sustained change and mutual benefits for overall health, well-being and performance.41–43

Oral health: Poor oral health is common in elite athletes. Oral health is a basic right of athletes but has consistently been shown to be poor with a high treatment need. Dental caries, dental erosion, periodontal disease and pericoronitis (infection around impacted teeth) are the principal oral health conditions affecting athletes. Dental trauma in ‘at-risk’ sports is also recognised. The effect of poor oral health on athletes may have both short-term and long-term consequences. In the short-term, poor oral health can cause pain and distress, difficulties in eating and sleeping, reduced quality of life and impact on performance (see below). The long-term consequences include increased risk of tooth loss, increased treatment need and resulting functional and psychological impairments.

Causes of poor oral health: There are many challenges to the oral health of elite athletes, some of which act at the level of the athlete and others within the peer, community and sport organisational level. These issues include nutritional challenges from frequent carbohydrate intake and acidic sports drinks, impairment of host responses due to dehydration, mouth drying and intensive training, poor health behaviours and oral health literacy and lack of effective health promotion/preventive support.

Impact on performance: Emerging athlete self-reported evidence suggests that poor oral health negatively affects the training and performance of athletes. The mechanisms behind this effect might include pain, reduced well-being and quality of life and increased systemic inflammation.

Improving and maintaining the oral health of athletes: Oral diseases are preventable with well-characterised interventions at low cost. Some interventions are more dependent on behavioural change and adherence to care than others. To achieve a sustained effect, oral health should be embedded within other aspects of health promotion taking into account the structural issues and inter-relationship of athletes within their sport and peer networks. Such an approach could in addition achieve mutual benefits for general health, well-being and performance. Regular assessments of oral health by a dental professional, especially preseason, will allow for personalisation of prevention plans and early treatment of any disease. National sport funders and policy organisations should take a lead in integrating such an approach. Mitigation of risk approaches should also be investigated as part of an oral health strategy.

Research and surveillance: The research base to inform sport and exercise medicine is limited in amount and quality.41 Priority research questions to address include careful epidemiological evaluations of representative samples of athletes to establish oral health needs across different sports, the determinants of oral health both of the individual and their environment and the impact and associated mechanisms of oral health on performance. The optimal preventive, health promotion and risk mitigation strategies within elite sport need to be assessed. Such a research strategy calls for the establishment of innovative networks using creative research designs with expertise across oral health, sport and exercise medicine and science, public engagement and sports governing and funding organisations.