Introduction: Obstructive sleep apnoea (OSA) is a prevalent, underdiagnosed disorder, with mouth breathing being a key clinical sign. "Mouth taping," a practice popularised by social media, has emerged as a purported "health hack" to force nasal breathing. The safety of this practice is uncertain, particularly for the large population of mouth breathers with undiagnosed nasal obstruction or OSA. This study compares the online trend against established clinical and search trends. Methods: A multi-source analysis was conducted. Australian Google search Trends (2014-2024): Monthly Relative Search Volume (RSV) was extracted for "mouth taping" (MT), "CPAP" (the gold-standard treatment), and "OSA" (the diagnosis). Hospital Data (2014-2024): Yearly hospital-coded OSA diagnoses in Australia were sourced from AIHW data. Analysis: Simple linear regression was performed on all trends. The growth trajectories were also visually analysed to assess for linear versus exponential patterns. A literature review was conducted to identify risks. Results: All trends showed a statistically significant increase. Formal hospital diagnoses of OSA grew at a steady, linear rate (Slope = +1758 diagnoses/year, p=0.026). Public search interest for "OSA" (Slope=0.268, p<0.001) and "CPAP" (Slope=0.486, p<0.001) also showed stable, linear growth. In stark contrast, "mouth taping" (MT) (Slope=0.520, p<0.001) demonstrated a non-linear, exponential "hockey-stick" trajectory, with interest remaining near-zero for years before exploding in 2021. Conclusion: Public interest in established OSA terms and formal diagnoses is growing steadily. However, interest in the unproven practice of mouth taping is accelerating at a faster, viral rate. This disconnect poses a significant public health risk, highlighting the dangers of rapid dissemination of misinformation.