- Dental prophylaxis within 4 weeks of Screening, tongue or lip piercing or presence of dental implants, desensitizing treatment within 8 weeks of Screening (professional sensitivity, treatments and non-dentifrice sensitivity treatments), gross periodontal disease, treatment of periodontal disease (including surgery)within 12 months of Screening, scaling or root planning within 3 months of Screening and teeth bleaching within 8 weeks of Screening