Pit and fissure caries
Pit and fissures are formed as a result of the merging of anatomical grooves present on the chewing surfaces of posterior teeth namely the premolars and molars. These pits and fissures are usually more profound in the molars as compared to the premolars, making it more prone to decay.
Yes, it is safe to swim while you on periods. Period blood doesn't flow outside the vagina like it usually does due to the counter-pressure of the water. But You still need to wear some a tampon or a menstrual cup to avoid getting into a sticky situation.
Resin tooth filling typically contains a filler particle such as quartz, which provides the mixture's strength and color. It is costly as compared to silver tooth filling.
In some cases, the change in period blood color can indicate a health problem like fibroids, low estrogen levels, and even vaginosis.