| Inclusion criteria | Exclusion criteria |
|---|---|
| - clinical crown of the first molars greater than 5 mm - the absence of cavities and / or periodontal disease - normal pH and salivary flow |
- pregnant and breastfeeding - users of dental prosthetics - presence of restored teeth - users of orthodontic appliances - dental sensitivity - smokers - aquatic sports practitioners - suffer from gastroesophageal dysfunction |