Son chipped lower left molar, a sliver the width of tooth & square. No pain, swelling, bleeding, but feels it when breathes thru mouth. Emergency?

Chipped molar. Have it checked by your dentist. It may be a small chip, or there may be a larger fracture, especially if there is a filling in the tooth. Sensitiviy to air (breathing) indicates that a deeper par of the tooth is now exposed.
Serious. Tooth is severely damaged and at risk of becoming extremely symptomatic. Your son has a problem that requires immediate Dental (not ER) attention. Like any fracture, this one needs care. Please call your Dentist now.

Related Questions

Son chipped molar, a sliver the width of tooth & square. No pain, swelling, bleeding, but feels it when breathes thru mouth. Emergency? On vacation.

Not an emergency. The good thing is he has no pain, so it is not an emergency. If the tooth itself is not very sensitive, treatment is less urgent, but the trip to his dentist should be arranged promptly. Have a nice vacation and take care. Read more...