Advantages:

• May be better tolerated
• No need to anesthetize nasal passages
• Larger ETT possible
• Shorter route
• Possibly more acceptable for post-operative care in ICU

Disadvantages:

• Less direct pathway – sharp angle from the oral cavity into the larynx
• Easy to stray from midline (use of an oral intubating device helps)

Advantages:

• Allows surgical access to oral cavity
• Possible in patients with very limited or no mouth opening
• Better choice if gag reflex persists despite best topicalization
• After entering naso-pharynx, the glottis is usually very apparent

Disadvantages:

• Passage through the nose is usually the most difficult part of the procedure and least well tolerated
• ETT size limitation
• Potential for epistaxis
• Potential for bacteraemia