Can a lip gloss really plump your pout? Dr Zara Kassam PhD finds out how they work and what they can do for your lips. Just like bold brows, fuller lips look like they’re here to stay. A plump pout is on almost everyone’s wish list and let’s face it, social media is full of them. But do you have to have an injection of fillers to get them? The answer is no, there are less invasive alternatives. The question is though – what’s in them, how do they work – or do they work at all –  and how long will…