Patients will brush their essix retainers with a toothbrush and with Geldis® gel.

Patients will leave their essix retainers in a glass with water and Polident tablets.

Patients will brush essix retainers with a toothbrush under running water.

Patients will clean their essix retainers with Geldis® using a toothbrush every night for 2 months.

% assessment of the amount of plaque on dental surfaces; it is detected on 4 surfaces: distal, mesial, vestibular, lingual / palatal. The number of sites with plaque is divided by the total number of sites available in the mouth and multiplied by 100. Results indicate the index as a percentage.

Site-specific assessment of the presence or absence of gum bleeding after the insertion of the periodontal probe for the detection of PPD, detected on 4 sites (mesial, distal, vestibular, palatal/lingual).

Percentage of sites with bleeding on probing determines the BOP%.

Scoring criteria:

• 0: the subject did not respond to air blasting;
• 1: the subject responded to air blasting;
• 2: the subject responded to air blasting and requested discontinuation;
• 3: the subject responded to air blasting, requested discontinuation and considered the stimulus to be painful.

Scoring criteria:

0: no erosive tooth wear;

1. initial loss of surface texture;
2. distinct defect, hard tissue loss < 50% of the surface area;
3. hard tissue loss ≥ 50% of the surface area.

Microbiological assessment of the following loads:

• Porphyromonas gingivalis
• Tannarella forsythensis
• Treponema denticola
• Peptostreptococcus micros
• Total bacterial load