Is a dog's mouth really cleaner then a humans by Logan Burke

Question: Is a dog's mouth really cleaner then a humans

My hypothesis: I believe that a humans mouth is going to be cleaner than a dogs because humans brush their teeth everyday while dogs eat food and never wash their mouths.

My procedure:

Step 1: Buy 1 pack of Prepared Nutrient Agar.

Step 2: Get two cotton swabs. Put one in my mouth and the other in my dog.

Step 3: Put one swab in one plate and one in the other. Move them around and then take them out.

Step 4: Also put water in one of them to show that I didn't get any other bacteria onto the plate

Step 5: Bring them to school and give it to my science teacher.

Step 6: Put them under a heat lamp.

Step 7: Let the bacteria grow for two days

Step 8: Record the data, count all the bacteria colonies

Risk and Safety: The bacteria from the dogs mouth and my mouth could infect someone

Data The dogs mouth had 455 colonies of bacteria while the teen had 15 and the baby had 40

Conclusion Clearly the dog had more bacteria then a human. My hypothesis was correct.

I wanted to see whether a dog’s mouth is actually cleaner than a human’s. My hypothesis is that a human’s mouth is going to be cleaner because humans brush their teeth 2 or 3 times a day. On the other hand, all dogs do is eat food and don’t brush their teeth. Dogs also lick people and chew on many dirty toys. Human’s mouths are going to be cleaner. I picked this project because I wanted to see if the myth was true or not.

The first thing that I did was put a plastic glove on my hand. Then I got ten cotton swabs for my agar plates. I got eight agar plates so I could put the bacteria on separate ones. I put two cotton swabs in my mouth and put them onto two agar plates. Then I got two more cotton swabs and put them into purified water and put them onto separate plates. Once I caught my dog I did the same thing to him. I also did that to my one year old brother. Once that was done I brought all eight of my agar plates to school so I could put them under a heat lamp. I then put all of them under a black piece of paper so the heat couldn’t escape. Then I took them out after three days and examined them.

After three days the plates were ready to be looked at. When I uncovered the black paper that was put on top I soon found out that my hypothesis was correct. The teen’s mouth only had 16 bacteria colonies. When I took a look at the dog’s plate I was surprised to see that it had 447.5 bacteria colonies. The dog’s plate had 431.5 more bacteria colonies then the teen’s. This concluded my experiment

I concluded that a dog’s mouth is actually dirtier than a humans. This makes sense because dogs do not care how their mouth and teeth look. Humans like to have their breath smelling nice and their teeth white. SInce a baby doesn’t brush their teeth their mouth will certainly be dirtier than a teen’s but less than a dog’s. All in all, a dog has the dirtiest mouth and the teen has the cleanest mouth.