Does touching the ground with the mouth or lips during prostration—whether intentionally or unintentionally, and with or without dhikr—invalidate the prayer?

The majority of scholars hold that the forehead alone is the pillar of prostration (sujood). If the forehead touches the ground during prostration, the act is complete. Likewise, the majority of scholars do not consider the glorification (tasbeeh) in prostration to be obligatory. Therefore, the prayer is valid, and what occurred does not affect it. It is recommended to disregard these whisperings (waswas).