Morning breath is caused by bacteria that thrive in the mouth overnight due to reduced saliva production. These bacteria produce odor-causing compounds. While some bacteria protect against harmful invaders, they also contribute to cavities and gum disease. Saliva usually helps control bacteria by washing them away and contains antimicrobial agents like lactoferrin. At night, less saliva is produced, allowing bacteria to grow and produce odors similar to rotten eggs and other unpleasant smells.

What is one reason our breath smells bad in the morning?

• Bacteria produce pleasant fragrances overnight.

• Bacteria thrive in the mouth due to warmth and food particles.

• The body releases toxins through the mouth at night.

• The mouth is too dry for bacteria to survive.

How does saliva help control bacteria in the mouth?

• By creating a dry environment.

• By providing nutrients for bacteria.

• By sweeping bacteria and food particles down the esophagus.

• By increasing the temperature in the mouth.

What happens to saliva production at night?

• It becomes more acidic.

• It remains the same as during the day.

• It increases significantly.

• It decreases, allowing bacteria to flourish.

Which compound is responsible for the rotten egg smell in morning breath?

• Cadaverene

• Isovaleric acid

• Methanthiol

• Hydrogen sulfide

What is Cadaverene responsible for in terms of smell?

• The fragrance of pine trees

• The aroma of fresh bread

• The smell of rotting flesh

• The scent of fresh flowers