Why do I feel like my lips are getting thinner and my smile is getting wider? What could be the reason?

Thinning of the lips is a natural process of aging. which consists of Collagen decreases by approximately 1% per year. Fat atrophy and Jaw bone collapse

Many people mistakenly believe that if their lips become thinner, they should exercise their lips frequently, like going to the gym to build bigger arm and leg muscles. In reality, the structure of the lips is different. "Specific" And it's completely different from other muscles in the body.

The fullness of the lips we see doesn't primarily come from muscle like in the upper arms or thighs. The lips are... "Soft tissue" It consists of the thinnest layer of skin (vermilion), easily atrophied fat, and a dense network of collagen, even with the presence of muscles surrounding the mouth called Orbicularis Oris It exists, but it only serves one function. "Open, close, and move your mouth." That alone doesn't serve the function of creating a thick, firm shape. Therefore, when... Collagen and fat layers atrophy. The mouth becomes flattened and folded inward because there is no "sponge" inside to support and keep it inflated.

Why can't we "lift weights" to make our lips thicker like we can our arms and legs?
The reason why lip exercises don't help to thicken the lips is because the muscles around the mouth are... "Sphincter muscle" These muscles are circular in shape, unlike the striated muscles of the arms and legs, which are long, thin bundles of muscle that are easier to build strength and increase size (hypertrophy). Importantly, The more you move or tense your mouth muscles... For example, sucking water through a straw or puckering your lips will actually cause it. "Vertical lines" (Smoker's Lines) And it makes the lips look even more wrinkled and thinner because it compresses the already depleted collagen, causing it to break down faster. Therefore, restoring fullness to the lips requires focusing on... "Tissue replenishment" It's not about building muscle.