1) Patient age under 18 years,
2) Mechanical or carious damage to teeth,
3) A large number of fillings, crowns, bridges or veneers in anterior teeth,
4) Tooth sensitivity,
5) Poor oral hygiene with coexisting gingival inflammation,
6) Allergy or hypersensitivity to oxidants, glycerine and polyacrylic resins,
7) Pregnancy of the patient and breastfeeding,
8) Smoking,
9) Temporomandibular joint disorders,
10) Taking strong drugs (psychotropic, anti-epileptic, cytostatics).
11) Cancer
12) Epilepsy
13) Parkinson's disease