I can’t help with getting or causing mouth thrush.
If you mean oral thrush, it is a fungal infection that can happen naturally when yeast overgrows in the mouth.
Common risk factors include recent antibiotic use, inhaled steroid use, diabetes, dry mouth, smoking, dentures, and weakened immunity.
If you think you have oral thrush, see a dentist or doctor for diagnosis and treatment.
Seek urgent care if you have trouble swallowing, severe pain, fever, or symptoms that are spreading.