# Effects of Dose and Injection Site for Gummy Smile Treatment With Botulinum Type A

> **NCT04820543** · PHASE4 · COMPLETED · sponsor: **Peking University** · enrollment: 55 (actual)

## Conditions studied

- Smiling
- Botulinum Toxins, Type A

## Interventions

- **DRUG:** injection of Botulinum type A

## Key facts

- **NCT ID:** NCT04820543
- **Lead sponsor:** Peking University
- **Sponsor class:** OTHER
- **Phase:** PHASE4
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2019-02-20
- **Primary completion:** 2019-11-20
- **Final completion:** 2020-06-20
- **Target enrollment:** 55 (ACTUAL)
- **Last updated:** 2021-04-01


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04820543

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04820543, "Effects of Dose and Injection Site for Gummy Smile Treatment With Botulinum Type A". Retrieved via AI Analytics 2026-06-01 from https://api.ai-analytics.org/clinical/NCT04820543. Licensed CC0.

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