The scientific explanation includes time of day, suspended air particles, and angle of the sun compared to the earth.
The sun looks whiter-brighter when it is typically overhead with a non-overcast sky between 11 AM and 1 PM. When there is less smog pollutants, the sun also looks whiter-brighter. As time passes, the heat index typically increases, clouds form together, and the sun may take on a yellowish hue until as we know, when the sun sets on the horizon, the sun takes on beautiful shades of orange, yellow and red. The reason for these colors is because you are viewing the sun at a small angle which causes the air particles to reflect the sun's rays in a variety of colors.
Regards celebrities teeth, you can put your own spin on that and you still don't need to be a dentist. The honorary advanced degree in suspect education goes to Sergio, Thank you for unwittingly collaborating in my Carvel Ice Cream Cake surprise to my buddies Bill & Dave.