Clinical Trial to Assess Whitening Efficacy and Safety of a 6% Hydrogen Peroxide Whitening Strip

A Clinical Trial to Assess Whitening Efficacy and Safety of a 6% Hydrogen Peroxide Whitening Strip

 

Objective

To evaluate whether the GuruNanda 6% hydrogen peroxide whitening strip produces greater tooth whitening than a matching placebo strip over a 7-day period, while assessing oral soft-tissue safety, adverse events, tooth sensitivity, and gingival irritation.

Process

This randomized, double-blind, placebo-controlled clinical study enrolled 64 adult subjects who were randomized 1:1 to receive either the GuruNanda 6% hydrogen peroxide whitening strip or a matching placebo strip containing no active whitening agent. Subjects applied one strip once daily for 30 minutes to the facial surfaces of the six maxillary anterior teeth (#6-#11) over 7 days. Tooth shade was assessed at Baseline, Day 4, and Day 7 using the VITA Classical shade guide and converted to value-ordered Shade Guide Units (SGU), where a positive SGU change indicates a lighter, whiter shade.

The primary endpoint was the per-subject mean SGU change from Baseline to Day 7. Safety was assessed at each scheduled visit by a California-licensed examiner through oral soft-tissue examination and adverse-event collection. The primary evaluable population included 30 active subjects and 31 placebo subjects; all 64 randomized subjects were included in the safety population.

 

Results

1. Primary Whitening Efficacy

At Day 7, the active whitening strip produced a mean shade improvement of +4.26 SGU compared with +0.56 SGU for placebo. This represents a +3.69 SGU advantage for the active strip and shows a clear whitening benefit after 7 days of once-daily use. The difference between the active strip and placebo was statistically significant and supported by multiple analyses.

Figure 1. Mean SGU change from Baseline to Day 4 and Day 7. Higher SGU change indicates greater whitening.

3. Responder Analysis

Responder rates were substantially higher in the active group. At the >=2 SGU threshold, 93% of active subjects responded compared with 16% of placebo subjects. At the >=1 SGU threshold, 97% of active subjects responded compared with 23% of placebo subjects. Both comparisons were statistically significant (Fisher exact p < 0.0001).

Figure 2. Day 7 responder rates by treatment group. Responder thresholds were defined as >=1 SGU and >=2 SGU improvement from Baseline.

4. Safety and Tolerability

No adverse events were reported in either arm. No subject reported tooth sensitivity or gingival irritation. Oral soft-tissue examinations were normal at every scheduled visit, and no protocol deviations were identified.

Conclusion

The GuruNanda 6% hydrogen peroxide whitening strip demonstrated a clear and meaningful whitening benefit compared with placebo after 7 days of once-daily use. The active strip produced an average improvement of +4.26 SGU, with a +3.69 SGU advantage over placebo, and the effect was evident by Day 4. Responder analyses further supported efficacy, with 93% of active subjects achieving at least a 2-SGU improvement compared with 16% of placebo subjects. The product was well tolerated under the study conditions, with no reported adverse events, no reported tooth sensitivity or gingival irritation, normal oral soft-tissue examinations, and no protocol deviations.