Effect of an Experimental Cannabidiol Gel on Tooth Sensitivity

Phase 1

Not yet recruiting

• Conditions: Dentin Sensitivity
• Interventions: Drug: Natrosol 4% Gel; Drug: Potassium nitrate and sodium fluoride; Drug: Cannabidiol (CBD) Gel

• Registration Number: NCT07027566
• Lead Sponsor: Universidade Federal do Para

Brief Summary

The goal of this clinical trial will be to evaluate the effect applying an experimental gel based on cannabidiol oil (CBD) on tooth sensitivity induced by tooth bleaching with 35% hydrogen peroxide (HP). Volunteers will be selected and allocated to the following groups: GP - placebo gel, GCBD - experimental cannabidiol gel and GKF - Potassium Nitrate and Sodium Fluoride Gel. In each group, the corresponding desensitizing gel will be applied to on the teeth for 10 minutes. All groups will then undergo in-office whitening treatment with 35% hydrogen peroxide. Patients will be instructed to record tooth sensitivity on a daily basis during the 21 days of follow-up. Pain intensity will be measured using a visual analog scale (VAS), while the risk of developing sensitivity will be recorded after each session of the whitening procedure, with two response option.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2025-05-14
• Status Verified: 2025-06
• Study First Submitted QC: 2025-06-10
• Last Update Submitted: 2025-06-10
• Study First Posted: 2025-06-18
• Last Update Posted: 2025-06-18
• Study Start: 2025-07-25
• Primary Completion: 2026-05
• Study Completion: 2026-07

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 75

Inclusion Criteria

• Participants must have at least 28 teeth in the cavity
• Good oral and general health

Exclusion Criteria

• active caries or periodontal disease
• visible cracks in front teeth upper or lower
• with evident malocclusion
• restorations and prosthetics in teeth anterior teeth
• gastroesophageal disorders
• severe internal tooth discoloration (tetracycline , fluorosis or pulped teeth)
• dentin exposure in anterior teeth and /or later
• parafunctional habits
• tooth sensitivity
• whitening treatment prior to or undergoing orthodontic treatment
• Furthermore, smokers, pregnant or breastfeeding women do not will be included.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Placebo group	Natrosol 4% Gel	The placebo gel (PG) (natrosol 4%) will be applied to the buccal surfaces of the central and lateral incisors, canines and upper and lower premolars, with a microbrush actively, for 10 minutes. Subsequently, all groups will undergo in-office whitening treatment with 35% hydrogen peroxide (Whiteness HP, FGM). Sensitivity assessment will be carried out using a form consisting of a visual analogue scale (VAS), patients will be instructed to record tooth sensitivity daily, during the 21 days of follow-up. To measure color, the VITA Easyshade spectrophotometer (VITA, Germany)) will be used at two times: baseline (Ti) and one week after the 3rd bleaching session (Tf).
Control group	Potassium nitrate and sodium fluoride	gel with 5% potassium nitrate and 2% sodium fluoride The gel with 5% potassium nitrate and 2% sodium fluoride (NKFG) will be applied to the buccal surfaces of the central and lateral incisors, canines and upper and lower premolars, with a microbrush actively, for 10 minutes. Subsequently, all groups will undergo in-office whitening treatment with 35% hydrogen peroxide (Whiteness HP, FGM). Sensitivity assessment will be carried out using a form consisting of a visual analogue scale (VAS), patients will be instructed to record tooth sensitivity daily, during the 21 days of follow-up. To measure color, the VITA Easyshade spectrophotometer (VITA, Germany) will be used at two
Experimental group	Cannabidiol (CBD) Gel	The experimental 2% cannabidiol gel (GCBD) will be applied to the buccal surfaces of the central and lateral incisors, canines and upper and lower premolars, with an active microbrush, for 10 minutes. Subsequently, all groups will undergo in-office whitening treatment with 35% hydrogen peroxide (Whiteness HP, FGM). Sensitivity assessment will be carried out using a form consisting of a visual analogue scale (VAS), patients will be instructed to record tooth sensitivity daily, during the 21 days of followup. To measure color, the VITA Easyshade spectrophotometer (VITA, Germany) will be used at two times: baseline (Ti) and one week after the 3rd bleaching session (Tf).

Primary Outcome Measures

Name	Time	Method
Measure Degree of Tooth Sensitivity (pain) by a visual analog scale (VAS) After Tooth Whitening	immediately after the intervention, and for a period of 21 days of treatment	Experimental cannabidiol and gel (experimental group) and potassium nitrate gel (control group) can change sensitivity related to tooth whitening with hydrogen peroxide 35%. So it is necessary measure this pain. The volunteers will mark on the scale (VAS) the level (1-10) of sensitivity immediately after the intervention, and for a period of 21 days of treatment.

Secondary Outcome Measures

Name	Time	Method
Change in Color of Teeth Bleached by spectrophotometer (VITA Easyshade)(quantitative method: (ΔE00)	There will be two colors readings: - 1: Ti: Base line (Until star first bleaching session); - 2: Tf: one week after the last bleaching session.	Silicone trays will be made, with canine-by-canine impressions. A window will be created on the vestibular surface of each canine of the silicone guide using a metal device with a radius of 6 mm, corresponding to the diameter of the spectrophotometer tip. The tip of the device will be inserted into the silicone guide to obtain the color parameters of the CIEL\*a\*b\* system, where L\* represents the value (light or dark); a\* is a measurement of red (a\* positive) or green (a\* negative); b\* is a measurement of yellow (b\* positive) or blue (b\* negative). The sum of the measured values of the upper canines will be used to obtain the averages of each L\*a\*b\* coordinate for each patient. ΔL\*, Δa\* and Δb\* will be calculated by the difference between the time intervals. Subsequently, the color difference between baseline (Ti) and one week after the 3rd bleaching session (Tf) will be calculated using the CIEDE2000 formulas (ΔE00).

Trial Locations

Locations (1)

Federal University of Pará School of Dentistry; 🇧🇷 Belém, PA, Brazil