- Clorhexidine Gel (LACER®, Barcelona, Spain) 0.12%, application 2 times / days for 1 month. The gel will be applied two times/day each 12 hours to the gingiva and mucosa.

- 80% Aloe vera gel, application 2 times / day for 1 month

Master formula of 80% aloe vera gel Aloe Vera extract, obtained from the central part of the caudal leaves of plants with more than 8 years of life, eliminating its bark. Formulated with carbopol, hydrophilic crosslinked polymer of acrylic acid and vitamin C. The mixture is presented in containers that serve as a container for preparation and will be dispensed in the canister format with applicator tube.

Together with the dispensing container, the dosing and dosage of the gel in research will be attached, with the description of the pharmaceutical form, packaging and labeling of the product. Packages with 8 ml of the gel under investigation, sufficient treatment for 1 month of applications. Posology: After tooth brushing, apply a small amount of gel on the fingertip of a freshly washed finger and spread it over the gum, doing a gentle massage, for 15 ", 2 times a day after proper oral hygiene and it is recommended not to ingest no liquid or food until after half an hour of use.

The patient will attend his scheduled appointment for bracket cementation. Before cementing, we will complete the clinical history (frequency of brushing, smoker or non-smoker, age, sex) aided by intraoral photographs, always collected in the same order according to protocol and by the same researcher. After the cementation, the patient will be included in the study in a random way in the corresponding group. One month after cementing and coinciding with the periodic visit of the patient, the presence / absence of friction or traumatic ulcers will be evaluated.

One month after cementing and coinciding with the periodic visit of the patient, the presence / absence gingival inflammation through the gingival inflammation index will be evaluated.

0 = Normal gingiva, absence of inflammation, no change in color, no bleeding.

1 = slight inflammation, slight change in color, small alteration of the surface, no hemorrhage. 2 = Moderate inflammation, redness, edema and hemorrhage on probing and pressure. 3 = Strong inflammation, intense redness, edema, tendency to hemorrhages, eventually ulceration. It is interpreted as follows: Sum of the degree of each face / No. of faces observed 0.0-1.0 = incipient gingivitis 1.1-2.0 = Moderate gingivitis 2,1-3,0 = Severe gingivitis

The study subject is obliged to communicate, by telephone or personally, any type of symptom: redness (erythema), thickening (edema) and peeling (ulcer) occurred after application of the products under study, and will must immediately interrupt the use of it, registering the adverse effects and number of participants with treatment related adverse events as assessed by CTCAE v4.0 and using as a rescue product for the treatment of contact mucositis and antiallergic drugs.