At children's check-ups, dentists at Hanoi Smile ask parents about habits, because long-lasting habits can affect teeth and jaw development.

- Thumb sucking or prolonged pacifier use: protruding upper front teeth, open bite.
- Tongue thrusting: open bite, spacing.
- Mouth breathing: often related to ENT problems, may affect arch shape.
- Lip or nail biting, grinding.
Gently remind the child; if habits continue beyond about age 4 or teeth are misaligned, have the child assessed.
Note: Treatment indications and outcomes depend on each person's oral condition, general health and home care. This article is for general information only; an in-person examination is needed for individual advice.
