Clinical Trial to Assess Whitening Efficacy and Safety of a 2% Hydrogen Peroxide Whitening Strip

A Clinical Trial to Assess Whitening Efficacy and Safety of a 2% Hydrogen Peroxide Whitening Strip

 

Objective

To evaluate whether the GuruNanda 2% hydrogen peroxide whitening strip produces greater tooth whitening than a matching placebo strip over a 14-day treatment period, while assessing oral soft-tissue safety, adverse events, protocol deviations, and product tolerability.

 

Process

This randomized, double-blind, placebo-controlled clinical study enrolled 65 adult subjects who were randomized to receive either the GuruNanda 2% 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 maxillary anterior teeth over a 14-day treatment period.

Tooth shade was assessed at Baseline, Week 1, and Week 2 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 Week 2. The primary evaluable population included 31 active subjects and 30 placebo subjects.

 

Results

1. Primary Whitening Efficacy

At Week 2, the active 2% hydrogen peroxide whitening strip produced a mean shade improvement of +1.55 SGU compared with +0.02 SGU for placebo. This represents a +1.52 SGU advantage for the active strip after 14 days of once-daily use. The difference between active and placebo was statistically significant (p < 0.0001).

Figure 1. Mean SGU change from Baseline to Week 1 and Week 2. Higher SGU change indicates greater whitening.

2. Statistical Support

The active 2% hydrogen peroxide whitening strip produced significantly greater whitening than placebo after 14 days. The active group improved by +1.55 SGU, compared with +0.02 SGU for placebo. The adjusted difference was +1.52 SGU, and the result was statistically significant across multiple analyses. The active strip also met the study’s pre-specified whitening criterion of at least 1 SGU improvement, while placebo did not.

3. Responder Analysis

Responder analysis further supported the whitening result. At Week 2, 27 of 31 active subjects (87.1%) achieved at least a 1 SGU improvement from Baseline, compared with 0 of 30 placebo subjects. This comparison was statistically significant (Fisher exact p < 0.0001).

Figure 2. Week 2 responder rate by treatment group. Responder threshold was defined as >=1 SGU improvement from Baseline.

4. Safety and Tolerability

No adverse events, serious adverse events, oral soft-tissue changes, or protocol deviations were reported at the scheduled study visits.

 

Conclusion

The GuruNanda 2% hydrogen peroxide whitening strip demonstrated a clear and meaningful whitening benefit compared with placebo after 14 days of once-daily use. The active strip produced an average improvement of +1.55 SGU, with a +1.52 SGU advantage over placebo, and 87.1% of active subjects achieved at least a 1 SGU improvement compared with 0% of placebo subjects.

The product was well tolerated under the study conditions, with no reported adverse events, no serious adverse events, no oral soft-tissue changes, no protocol deviations, and 100% mean treatment compliance in both groups.